Wikipedia:WikiProject Core Content/Articles
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[edit]- ...Baby One More Time (song)
- .exe
- 'Asir Province
- "Hello, World!" program
- (I Can't Get No) Satisfaction
- (Sittin' On) The Dock of the Bay
- −1
- 0
- 1 Esdras
- 1 Maccabees
- 1,1,1,2-Tetrafluoroethane
- 1,2-rearrangement
- 1,4-Dioxane
- 1
- 2 Maccabees
- 2 Pallas
- 2-in-1 PC
- 2
- 2channel
- 2I/Borisov
- 2MASS
- 3
- 3C 273
- 3D printing
- 3dfx Interactive
- 3M
- 4 Vesta
- 4
- 4′33″
- 4chan
- 5-cell
- 5.56×45mm NATO
- 5
- 6
- 7 July 2005 London bombings
- 7
- 7th Heaven (TV series)
- 7z
- 8-bit computing
- 8
- 8½
- 9
- 9×19mm Parabellum
- 10 Hygiea
- 10
- 12 Angry Men (1957 film)
- 16-bit computing
- 16-cell
- 16th Street Baptist Church bombing
- 20th Century Studios
- 20th-century classical music
- 20th-century music
- 21st-century classical music
- 24 (TV series)
- 24 Parganas
- 24-cell
- 30 Rock
- 32-bit computing
- 47 Tucanae
- 51 Pegasi b
- 55 Cancri e
- 60 Minutes
- 64-bit computing
- 99 Bottles of Beer
- 120-cell
- 341
- 600-cell
- 709 crackdown
- 1556 Shaanxi earthquake
- 1600–1650 in Western European fashion
- 1755 Lisbon earthquake
- 1812 Overture
- 1834 Additional Act
- 1887 Yellow River flood
- 1889 Apia cyclone
- 1892 Coeur d'Alene labor strike
- 1902 eruption of Mount Pelée
- 1905 Russian Revolution
- 1911 Revolution
- 1913 Ottoman coup d'état
- 1921–1922 famine in Tatarstan
- 1931 China floods
- 1932 New South Wales constitutional crisis
- 1935 Shinchiku-Taichū earthquake
- 1937 Fox vault fire
- 1944 Romanian coup d'état
- 1948 Arab–Israeli War
- 1948 Czechoslovak coup d'état
- 1953 Iranian coup d'état
- 1954 Geneva Conference
- 1954 Guatemalan coup d'état
- 1956 Poznań protests
- 1959 Tibetan uprising
- 1963 South Vietnamese coup
- 1966 anti-Igbo pogrom
- 1968 Olympics Black Power salute
- 1970 Bhola cyclone
- 1971 Bangladesh genocide
- 1973 Chilean coup d'état
- 1973 oil crisis
- 1975 Australian constitutional crisis
- 1976 Tangshan earthquake
- 1982 invasion of the Falkland Islands
- 1987 Fijian coups d'état
- 1989 Tiananmen Square protests and massacre
- 1991 Bangladesh cyclone
- 1991 Soviet coup d'état attempt
- 1992 Los Angeles riots
- 1993 Russian constitutional crisis
- 1998 Russian financial crisis
- 1999 East Timorese crisis
- 1999 Jiji earthquake
- 2000 Fijian coup d'état
- 2000s in science and technology
- 2001: A Space Odyssey (film)
- 2002 Bali bombings
- 2002 Venezuelan coup d'état attempt
- 2002–2004 SARS outbreak
- 2003 invasion of Iraq
- 2004 Haitian coup d'état
- 2004 Indian Ocean earthquake and tsunami
- 2004 Madrid train bombings
- 2005 Cronulla riots
- 2005–2006 Fijian political crisis
- 2005–2006 Thai political crisis
- 2006 Fijian coup d'état
- 2006 Lebanon War
- 2008 Mumbai attacks
- 2008 Sichuan earthquake
- 2008 Universal Studios fire
- 2009 swine flu pandemic
- 2010 Haiti earthquake
- 2011 Egyptian revolution
- 2011 Norway attacks
- 2011 South Sudanese independence referendum
- 2011 Tōhoku earthquake and tsunami
- 2011–2015 Myanmar political reforms
- 2012 Benghazi attack
- 2012 China anti-Japanese demonstrations
- 2014 Gaza War
- 2014 NPCSC Decision on Hong Kong
- 2014 Vrbětice ammunition warehouses explosions
- 2015 European migrant crisis
- 2015 Rohingya refugee crisis
- 2015–16 Zika virus epidemic
- 2016 Turkish coup d'état attempt
- 2016–2017 Zimbabwe protests
- 2016–present purges in Turkey
- 2017 Las Vegas shooting
- 2017 Zimbabwean coup d'état
- 2019 Bolivian political crisis
- 2019 Bolivian protests
- 2019 Samoa measles outbreak
- 2019–20 Australian bushfire season
- 2019–2020 Hong Kong protests
- 2019–2021 Persian Gulf crisis
- 2019–2024 Sudanese transition to democracy
- 2020 Beirut explosion
- 2020 Indian agriculture acts
- 2020 Nagorno-Karabakh war
- 2021 Israel–Palestine crisis
- 2021 Myanmar coup d'état
- 2021 Solomon Islands unrest
- 2021 Taliban offensive
- 2021–2022 global supply chain crisis
- 2022 Kazakh unrest
- 2022 Russian invasion of Ukraine
- 2060 Chiron
- 2666
- 50000 Quaoar
- 90377 Sedna
- 225088 Gonggong
- 486958 Arrokoth
- A Bar at the Folies-Bergère
- A Brief History of Time
- A cappella
- A Chorus Line
- A Christmas Carol
- A Clockwork Orange (film)
- A Clockwork Orange (novel)
- A Confederacy of Dunces
- A Connecticut Yankee in King Arthur's Court
- A Coruña
- A Cotton Office in New Orleans
- A Country Practice
- A Dance of the Forests
- A Dance to the Music of Time
- A Day in the Life
- A Dictionary of the English Language
- A Doll's House
- A Estrada
- A Farewell to Arms
- A Fonsagrada
- A Harlot's Progress
- A House for Mr Biswas
- A Love Supreme
- A Midsummer Night's Dream (Mendelssohn)
- A Midsummer Night's Dream
- A Mighty Fortress Is Our God
- A Moveable Feast
- A Passage to India
- A Portrait of the Artist as a Young Man
- A Prairie Home Companion
- A priori and a posteriori
- A Psalm of Life
- A Raisin in the Sun
- A Room of One's Own
- A Room with a View
- A Season in Hell
- A Series of Unfortunate Events
- A Streetcar Named Desire
- A Study in Scarlet
- A Study of History
- A Sunday Afternoon on the Island of La Grande Jatte
- A Tale of Two Cities
- A Tree Grows in Brooklyn (novel)
- A Trip to the Moon
- A True Story
- A value
- A Vindication of the Rights of Woman
- A. A. Milne
- A. B. Frost
- A. Barton Hepburn
- A. G. Edwards (bishop)
- A. Lawrence Lowell
- A. P. Hill
- A/B testing
- Aabenraa Municipality
- Aachen
- Aahat
- Aalborg
- Aalen
- Aalst, Belgium
- Aardvark
- Aardwolf
- Aare Gorge
- Aargau
- Aarhus
- Aaron Arrowsmith
- Aaron Bernstein
- Aaron Burr
- Aaron Chorin
- Aaron
- AB InBev
- Aba, Nigeria
- Ababda people
- Abacus
- Abadan Crisis
- Abadan Island
- Abadan, Iran
- Abaddon
- Abadeh
- Abakan
- Abalone
- Abano Terme
- Abaris the Hyperborean
- Abatis
- Abbadid dynasty
- Abbadie
- Abbahu
- Abbas I of Egypt
- Abbas II of Egypt
- Abbas Mirza
- Abbas the Great
- Abbasid Caliphate
- Abbasid Revolution
- Abbe number
- Abbé Prévost
- Abbess
- Abbeville
- Abbevillian
- Abbey of Saint Wandrille
- Abbey Road
- Abbot
- Abbots Bromley Horn Dance
- Abbott Handerson Thayer
- Abbreviation
- Abbreviator
- Abby Hadassah Smith
- Abby Kelley
- Abby Lillian Marlatt
- Abby Morton Diaz
- ABC (newspaper)
- ABC FlowCharter
- ABC islands (Leeward Antilles)
- Abd al-Aziz
- Abd al-Ghani al-Nabulsi
- Abd al-Hafiz
- Abd al-Rahman I
- Abd al-Rahman III
- Abd Allah ibn Sa'd
- Abd ar-Rahman II
- Abdallahi ibn Muhammad
- Abdel Hakim Amer
- Abdelaziz of Morocco
- Abdera, Spain
- Abdera, Thrace
- Abdias Maurel
- Abdomen
- Abdominal pain
- Abdul Hamid II
- Abdul Latif
- Abdul Rahman al-Eryani
- Abdulaziz
- Abdulmejid I
- Abdur Rahman Khan
- Abe Ruef
- Abel Herzberg
- Abel Servien
- Abel-beth-maachah
- Abel-François Villemain
- Abelian group
- Abelin
- Abelisauridae
- Abencerrages
- Abensberg
- Abeokuta
- Abercarn
- Aberdare
- Aberdeen Angus
- Aberdeen, South Dakota
- Aberdeen
- Aberdeenshire (historic)
- Aberdour
- Abergavenny
- Aberration (astronomy)
- Abersychan
- Abertillery
- Abettor
- Abeyance
- Abgar V
- Abha
- Abhibhavayatana
- Abhidhammattha-sangaha
- Abhidhammāvatāra
- Abhidharma
- Abhisamayalankaraloka
- Abhorrers
- Abia State
- Abiathar
- Abidjan
- Abigail Goodrich Whittelsey
- Abigail Masham, Baroness Masham
- Abigail
- Abildgaard
- Abilene (biblical)
- Abiod Valley
- Abiogenesis
- Abipón
- Abjuration
- Abkhaz language
- Abkhazia
- Ableism
- Ableman v. Booth
- Abner Doubleday
- Abner
- ABO blood group system
- Abolition of the han system
- Abolitionism
- Abomey
- Abor Hills
- Aboriginal Australians
- Aboriginal Protection Act 1869
- Abortion debate
- Abortion law
- Abortion
- Abraham a Sancta Clara
- Abraham Accords
- Abraham Bloemaert
- Abraham Calovius
- Abraham Cooper
- Abraham Cowley
- Abraham de Fabert
- Abraham de Moivre
- Abraham Ecchellensis
- Abraham Emanuel Fröhlich
- Abraham Fraunce
- Abraham Geiger
- Abraham Gottlob Werner
- Abraham Hyacinthe Anquetil-Duperron
- Abraham ibn Ezra
- Abraham Janssens
- Abraham John Valpy
- Abraham Lincoln
- Abraham Mapu
- Abraham Mignon
- Abraham Nicolas Amelot de la Houssaye
- Abraham Ortelius
- Abraham Raimbach
- Abraham Tucker
- Abraham van Diepenbeeck
- Abraham-men
- Abraham
- Abrahamic religions
- Abrahamites
- Abram Hewitt
- Abrantes
- Abrasion (geology)
- Abrasion (medical)
- Abrasive
- Abraum salts
- Abraxas
- Abruzzi e Molise
- Abruzzo
- Absalom, Absalom!
- Absalon
- Abscisic acid
- Abscission
- Absinthe
- Absolute configuration
- Absolute convergence
- Absolute dating
- Absolute electrode potential
- Absolute magnitude
- Absolute monarchy
- Absolute value
- Absolute zero
- Absolutely Fabulous
- Absorption (chemistry)
- Absorption (electromagnetic radiation)
- Absorption band
- Absorption spectroscopy
- Abstemius
- Abstract algebra
- Abstract art
- Abstract data type
- Abstract expressionism
- Abstract machine
- Abstraction (computer science)
- Abstraction
- Abu al-Atahiya
- Abu al-Faraj al-Isfahani
- Abu al-Faraj
- Abu al-Qasim
- Abu Bakr
- Abu Dhabi
- Abu Hamad
- Abu Hasan al-Ash'ari
- Abu Mansur Mauhub al-Jawaliqi
- Abu Musa
- Abu Nasr al-Jawhari
- Abu Qir
- Abu Sa'id Abu'l-Khayr
- Abu Simbel
- Abu Tammam
- Abu Ubayda ibn al-Jarrah
- Abu'l-Faḍl
- Abu'l-Fazl ibn Mubarak
- Abubakar Tafawa Balewa
- Abuja
- Abulfeda
- Abutment
- Abydos (Hellespont)
- Abydos, Egypt
- Abyssal hill
- Abyssal plain
- Abyssinian cat
- AC adapter
- AC power plugs and sockets
- AC power
- Acacia
- Acacius of Constantinople
- Academic art
- Academic conference
- Academic degree
- Academic discipline
- Academic freedom
- Academic journal
- Academic publishing
- Academic tenure
- Académie Française
- Academy Awards
- Academy of Motion Picture Arts and Sciences
- Academy of Television Arts & Sciences
- Academy
- Acadia National Park
- Açaí palm
- Acanthocephala
- Acanthodii
- Acanthophractida
- Acanthosoma
- Acanthostega
- Acanthuridae
- Acapulco
- Acaricide
- ACARS
- Acasta Gneiss
- Acatalepsy
- Accademia della Crusca
- Accelerating expansion of the universe
- Acceleration
- Accent (music)
- Accent (sociolinguistics)
- Accentor
- Accepted Frewen
- Acceptor (semiconductors)
- Access control
- Access token
- Accessory (legal term)
- Acciaioli family
- Accidental Death of an Anarchist
- Accipiter
- Accius
- Accommodation (eye)
- Accomplice
- Accordion
- Accountant general
- Accountant
- Accounting machine
- Accounting
- Accoutrements
- Accra
- Accretion (astrophysics)
- Accretion disk
- Accretionary wedge
- Accuracy and precision
- Accursius
- Accusation
- Aceh Sultanate
- Aceh
- Acehnese people
- Acela
- Acer Inc.
- Acer pseudoplatanus
- Acer rubrum
- Acer saccharinum
- Acer saccharum
- Acerenza
- Acervulus
- Acetaldehyde
- Acetate
- Acetic acid
- Acetone
- Acetylcholine
- Acetylene
- Achaea
- Achaeans (Homer)
- Achaemenes (satrap)
- Achaemenid Empire
- Achalpur
- Achatina
- Acheng District
- Achernar
- Acherontia lachesis
- Achill Island
- Achille Castiglioni
- Achille Ernest Oscar Joseph Delesse
- Achille Fould
- Achille Harlay de Sancy
- Achillea
- Achilles Tatius
- Achilles
- Achim von Arnim
- Achinsk
- Achromatopsia
- Achsah
- Achziv
- Aciclovir
- Acid anhydride
- Acid rain
- Acid salt
- Acid strength
- Acid–base homeostasis
- Acid–base reaction
- Acid
- Acidity function
- Acinaces
- Acireale
- Acland
- Acne
- Acoemetae
- Aconcagua River
- Aconcagua
- Aconchulinida
- Aconitum
- Acontius
- Acorn
- Acorus calamus
- Acoustic emission
- Acoustic microscopy
- Acoustic radiometer
- Acoustic resonance
- Acoustic trauma
- Acoustics
- Acousto-optic modulator
- Acqui Terme
- Acquittal
- Acre (state)
- Acre River
- Acre-foot
- Acre
- Acridine
- Acrobatics
- Acrolith
- Acromegaly
- Acron
- Acronym
- Acropolis of Athens
- Acrothoracica
- Acrux
- Acrylic paint
- Act of Sederunt
- Act utilitarianism
- Acta Senatus
- Acteon Group
- Actin
- Acting
- Actinide
- Actinium
- Actinobacillus
- Actinomycetales
- Actinomycosis
- Actinophryid
- Actinopterygii
- Actinozoa
- Action (firearms)
- Action (physics)
- Action Comics
- Action fiction
- Action film
- Action selection
- Activated complex
- Activated sludge
- Activation energy
- Active Archive Alliance
- Active Denial System
- Active Directory
- Active galactic nucleus
- Active Network, LLC
- Active optics
- Active transport
- ActiveMovie
- ActiveX Document
- ActiveX
- Activist shareholder
- Activity coefficient
- Actor
- Acts of the Apostles
- Acts of Union 1707
- Acts of Union 1800
- Actuarial science
- Actuator
- Acupuncture
- Acute (medicine)
- Acute medicine
- Ad-Dahna Desert
- Ada (programming language)
- Ada Lovelace
- Ada Negri
- Adab (city)
- Adage
- Adagio for Strings
- Adagio in G minor
- Adah Isaacs Menken
- Adal Sultanate
- Adalberon (bishop of Laon)
- Adalbert Falk
- Adalbert Merx
- Adalbert of Prague
- Adam Afzelius
- Adam and Eve
- Adam Bell
- Adam Black
- Adam Clarke
- Adam de la Halle
- Adam Duncan, 1st Viscount Duncan
- Adam Frans van der Meulen
- Adam Gottlob Moltke
- Adam Jerzy Czartoryski
- Adam Johann von Krusenstern
- Adam Kadmon
- Adam Karl August von Eschenmayer
- Adam Kraft
- Adam Marsh
- Adam Mickiewicz
- Adam Murimuth
- Adam Oehlenschläger
- Adam of Dryburgh
- Adam Olearius
- Adam Philippe, Comte de Custine
- Adam Skirving
- Adam Smith
- Adam Wilhelm Moltke
- Adam
- Adama
- Adamantane
- Adamantios Korais
- Adamawa State
- Adamites
- Adams–Onís Treaty
- Adana
- Adansonia
- Adapazarı
- Adaptation
- Adaptive optics
- Adat
- Adda (river)
- Addax
- Adder (electronics)
- Addiction
- Addis Ababa
- Addition Principle
- Addition reaction
- Addition
- Additive function
- Addressable cursor
- Addu Atoll
- Adelaide Anne Procter
- Adelaide Filleul, Marquise de Souza-Botelho
- Adelaide Island
- Adelaide Kemble
- Adelaide Neilson
- Adelaide Phillipps
- Adelaide Ristori
- Adelaide
- Adelard
- Adelardo López de Ayala y Herrera
- Adelbert von Chamisso
- Adeler
- Adélie Land
- Adelina Patti
- Adelung
- Adémar de Chabannes
- Ademption
- Aden
- Adenes Le Roi
- Adenine
- Adenosine triphosphate
- Adevism
- Adhan
- Adhemar of Le Puy
- Adhemar
- Adhesion
- Adhesive bonding
- Adhesive
- Adi Shankara
- Adiabatic process
- Adiaphora
- Adidas
- Adil Shahi dynasty
- Adin
- Adipocyte
- Adipose tissue
- Adirondack Mountains
- Adivasi
- Adjacency matrix
- Adjara
- Adjective
- Adjoint functors
- Adjutant general
- Administrative court
- Administrative division
- Administrative divisions of China
- Administrative divisions of Mexico
- Administrative divisions of Myanmar
- Administrative divisions of Taiwan
- Administrative divisions of the Philippines
- Administrative law
- Admiral
- Admiralty administration
- Admiralty court
- Admiralty Islands
- Admiralty law
- Ado of Vienne
- Adobe Acrobat
- Adobe After Effects
- Adobe Creative Suite
- Adobe Flash
- Adobe FreeHand
- Adobe Inc.
- Adobe PageMill
- Adobe Photoshop
- Adobe RGB color space
- Adobe
- Adolescence
- Adolf Bastian
- Adolf Bernhard Christoph Hilgenfeld
- Adolf Dehn
- Adolf Dygasiński
- Adolf Erik Nordenskiöld
- Adolf Erman
- Adolf Frederick of Sweden
- Adolf Frey
- Adolf Friedrich von Schack
- Adolf Furtwängler
- Adolf Glassbrenner
- Adolf Hitler
- Adolf Jellinek
- Adolf Kirchhoff
- Adolf Müllner
- Adolf Oberländer
- Adolf Rudnicki
- Adolf Schreyer
- Adolf von Baeyer
- Adolf von Harnack
- Adolf von Henselt
- Adolf von Sonnenthal
- Adolf Wilbrandt
- Adolf Wuttke
- Adolfo Pérez Esquivel
- Adolfo Venturi
- Adolph Francis Alphonse Bandelier
- Adolph Freiherr Knigge
- Adolph Green
- Adolph Hausrath
- Adolph Menzel
- Adolphe Crémieux
- Adolphe d'Archiac
- Adolphe d'Ennery
- Adolphe Granier de Cassagnac
- Adolphe Max
- Adolphe Napoléon Didron
- Adolphe Niel
- Adolphe Thiers
- Adolphe Willette
- Adolphus Ward
- Adoni
- Adoration
- Adorf
- Adorno family
- Adrano
- Adrar Plateau
- Adrenal gland disorder
- Adrenal gland
- Adrenaline
- Adriaan Reland
- Adriaen Brouwer
- Adriaen van de Velde
- Adriaen van Ostade
- Adrian Kantrowitz
- Adriano Castellesi
- Adrianus Turnebus
- Adriatic question
- Adriatic Sea
- Adrien Albert Marie de Mun
- AdS/CFT correspondence
- Adscript
- Adsorption
- Adullamites
- Adult contemporary music
- Adult
- Adulterant
- Adurim
- Advance Australia Fair
- Advanced Audio Coding
- Advanced Micro Devices
- Advanced RISC Computing
- Advanced SCSI Programming Interface
- Advanced Systems Format
- Advanced Video Coding
- Adventure fiction
- Adventure film
- Adventure Time
- Adventures of Huckleberry Finn
- Adverb
- Adverse effect
- Advertising in biology
- Advertising research
- Advertising
- Advocacy journalism
- Advocate
- Advocatus
- Advowson
- Adware
- Adye
- Adygea
- Adyton
- Adze
- Adzuki bean
- Aeacus
- Aecium
- Aeclanum
- Aedes aegypti
- Aedesius
- Aedicula
- Aedui
- Aegadian Islands
- Aegean civilization
- Aegean Sea
- Aegidius Tschudi
- Aegina
- Aegineta
- Aegirine
- Aegis
- Aegospotami
- Ælfheah of Canterbury
- Ælfric
- Aelia Capitolina
- Aelia Eudocia
- Aelianus Tacticus
- Aelius Aristides
- Aelius Donatus
- Aelius Festus Aphthonius
- Aelius Gallus
- Aelius Moeris
- Aelius Theon
- Ælla of Northumbria
- Aelred of Rievaulx
- Aemilius Asper
- Aemilius Macer
- Aeneas (biblical figure)
- Aeneas Tacticus
- Aeneas
- Aeneid
- Aeolian processes
- Aeolic verse
- Aeon
- Aepycamelus
- Aerarii
- Aerarium
- Aerated water
- Aerial advertising
- Aerial application
- Aerial refueling
- Aerial root
- Aerial tramway
- Aerial warfare
- Aeroacoustics
- Aerodynamic force
- Aerodynamics
- Aeroelasticity
- Aeroflot
- Aerosol
- Aerospace engineering
- Aerospace manufacturer
- Aerostat
- Aert van der Neer
- Aeschines
- Æsir
- Aesop's Fables
- Aesthetics
- Aestivation
- Æthelbald of Mercia
- Æthelberht of Kent
- Æthelberht, King of Wessex
- Æthelfrith
- Æthelred I of Wessex
- Æthelred of Mercia
- Æthelred the Unready
- Æthelstan
- Aether theories
- Aethicus Ister
- Aethionema
- Aethusa cynapium
- Aetius (general)
- Aëtius of Antioch
- Aetosaur
- Afanasy Nikitin
- Afanasy Ordin-Nashchokin
- Afar language
- Afar people
- Afar Region
- Afewerki
- Affair of the Diamond Necklace
- Affair of the Spanish Marriages
- Affection
- Affine space
- Affinity (law)
- Affirmation and negation
- Affirmative action
- Affonso Eduardo Reidy
- Affreightment
- Affymetrix
- Afghan Civil War (1989–1992)
- Afghan Civil War (1992–1996)
- Afghan Civil War (1996–2001)
- Afghan Girl
- Afghan peace process
- Afghanistan conflict (1978–present)
- Afghanistan
- AFL–CIO
- Afonso de Albuquerque
- Afonso I of Portugal
- Afonso II of Portugal
- Afonso III of Portugal
- Afonso IV of Portugal
- Afonso VI of Portugal
- Afqa
- Afrânio Coutinho
- Africa
- African Americans
- African art
- African Association
- African barbet
- African buffalo
- African bullfrog
- African bush elephant
- African Charter on Human and Peoples' Rights
- African civet
- African Development Bank
- African forest elephant
- African Great Lakes
- African horse sickness
- African lily
- African literature
- African Methodist Episcopal Church
- African National Congress
- African penguin
- African Plate
- African Pygmies
- African sacred ibis
- African spurred tortoise
- African swine fever virus
- African theatre of World War I
- African trypanosomiasis
- African Union
- African wild ass
- African wild dog
- African-American dance
- African-American history
- African-American Vernacular English
- Africanized bee
- Afrikaans
- Afro-Eurasia
- Afroasiatic languages
- Afrobeat
- Afsharid Iran
- After-school activity
- Afterglow
- Afterlife
- Aftermath of the January 6 United States Capitol attack
- Aftermath of World War I
- Aftermath of World War II
- Afternoon
- Aftershock
- Afyonkarahisar
- Aga Khan I
- Agadir
- Agaiambo
- Agaléga
- Agalychnis
- Agamemnon
- Agami
- Agamidae
- Aganju of Oyo
- Agape
- Agapemonites
- Agapetae
- Agaricus bisporus
- Agaricus
- Agartala
- Agarwood
- Agasias
- Agathangelos
- Agathangelus
- Agatharchides
- Agatharchus
- Agathias
- Agathis
- Agathocles
- Agathodaemon of Alexandria
- Agathodaemon
- Agathon Jean François Fain
- Agathon
- Agathosma
- Agave coetocapnia
- Agave
- Age of Discovery
- Age of Earth
- Age of Enlightenment
- Age of Liberty
- Age of Sail
- Age of the universe
- Age-area hypothesis
- Ageing
- Ageladas
- Agelenidae
- Agenais
- Agence France-Presse
- Ageng Tirtayasa of Banten
- Agénor Bardoux
- Agenor Maria Gołuchowski
- Agenor, duc de Gramont
- Agent Orange
- Agent-general
- Agesander of Rhodes
- Ageusia
- Agglomerate
- Aggradation
- Aggression
- Aggtelek
- Aghlabids
- Agio
- Agira
- Agistment
- Agitators
- Agkistrodon piscivorus
- Agnatha
- Agnes Bernauer
- Agnes of Merania
- Agnes Surriage Frankland
- Agni
- Agnoetae
- Agnoiology
- Agnolo Firenzuola
- Agnosticism
- Agnus Dei
- Agobard
- Agonalia
- Agonomycetes
- Agonothetes
- Agoracritus
- Agoranomos
- Agordat
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- Along the River During the Qingming Festival
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- Alonso Jerónimo de Salas Barbadillo
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- Alpha particle
- Alphabet Inc.
- Alphabet
- AlphaGo
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- Alphonse Daudet
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- Alphonse Juin
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- Alphonsus Liguori
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- Alveolate
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- Aponogeton madagascariensis
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- Apophyge
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- Apoptosis
- Aposiopesis
- Apostasy
- Apostille Convention
- Apostle spoon
- Apostles' Creed
- Apostolic Canons
- Apostolic Constitutions
- Apostolic Fathers
- Apostolic Majesty
- Apostomatida
- Apostrophe (figure of speech)
- Apostrophe
- Apotactics
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- Apotheosis
- Apotropaic magic
- Appalachia
- Appalachian Mountains
- Appaloosa
- Appanage
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- Apparitor
- Appeal
- Append
- Appendiculata
- Appendix (anatomy)
- Appenzell Ausserrhoden
- Appenzell Innerrhoden
- Appenzell
- Apperception
- Appetite for Destruction
- Appian
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- Appin
- Appius Claudius Crassus Inregillensis Sabinus
- Appius Claudius Sabinus Regillensis
- Applause
- Apple Daily
- Apple Extended Keyboard
- Apple File Exchange
- Apple II
- Apple Inc.
- Apple menu
- Apple of Discord
- Apple
- AppleShare
- Applet
- Application checkpointing
- Application Foundation Classes
- Application server
- Application service provider
- Application sharing
- Application software
- Application-level gateway
- Application-specific integrated circuit
- Applied arts
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- Applied linguistics
- Applied mathematics
- Applied mechanics
- Applied science
- Appomattox Court House National Historical Park
- Apponaug, Rhode Island
- Apportionment
- Appraiser
- Apprenticeship
- Appropriate technology
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- Appulse
- Appurtenance
- Aprey Faience
- Apricot
- Apries
- April Fools' Day
- April Uprising of 1876
- April
- Apsara
- Apsines
- Apsis
- Apt, Vaucluse
- Apterygota
- Aptian
- Apuan Alps
- Apulia
- Apure River
- Apure
- Apurímac River
- Apurinã
- Apus
- Apuseni Mountains
- Apyrexy
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- Aquae Cutiliae
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- Aquarii
- Aquarius (constellation)
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- Aquatic insect
- Aquatic locomotion
- Aqueduct (water supply)
- Aqueous solution
- Aquidneck Island
- Aquifer
- Aquila (constellation)
- Aquila of Sinope
- Aquila Romanus
- Aquilegia
- Aquitaine
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- Ara (bird)
- Ara (constellation)
- Arab Agricultural Revolution
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- Arab Higher Committee
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- Arabidopsis thaliana
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- Arabs
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- Aratus of Sicyon
- Aratus
- Arauca River
- Araucanía Region
- Araunah
- Aravidu dynasty
- Arawa, Bougainville
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- Arbogast (magister militum)
- Arboreal locomotion
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- Arcachon
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- Archaeopteridales
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- Archibald Forbes
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- Archibald Johnston
- Archibald Pitcairne
- Archibald Primrose, 5th Earl of Rosebery
- Archibald Sayce
- Archibald Wavell, 1st Earl Wavell
- Archidamus I
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- Archidamus V
- Archilochus
- Archimandrite
- Archimedes number
- Archimedes' principle
- Archimedes' screw
- Archimedes
- Archinephros
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- Archite
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- Architecture
- Architrave
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- Archive
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- ARD (broadcaster)
- Ardabil
- Ardashir II
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- Ardipithecus kadabba
- Ardipithecus ramidus
- Ardipithecus
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- Are You Experienced
- Are You There God? It's Me, Margaret.
- Area (architecture)
- Area density
- Area
- Arecaceae
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- Arecidae
- Aref al-Dajani
- Aremberg
- Arenaria balearica
- Arenberg
- Arene substitution pattern
- Arenig
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- Arent van Curler
- Areopagitica
- Arequipa
- Arero
- Ares
- Aretaeus of Cappadocia
- Aretha Franklin
- Arethusa (mythology)
- Arevaci
- Arfersiorfik Fjord
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- Argentaffin
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- Argentina
- Argentine ant
- Argentine Antarctica
- Argentine Basin
- Argentine War of Independence
- Argentinidae
- Argentinosaurus
- Argentite
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- Arghul
- Argillite
- Arginine
- Argo Navis
- Argon compounds
- Argon fluorohydride
- Argon–argon dating
- Argon
- Argonaut (animal)
- Argonauts
- Arguin
- Argulidae
- Argument of latitude
- Argument of periapsis
- Argument
- Argumentation theory
- Argumenty i Fakty
- Argungu
- Argyrodite
- Arhynchobdellida
- Ari Thorgilsson
- Aria
- Ariake Sea
- Ariane Mnouchkine
- Arianespace
- Arianism
- Ariano Irpino
- Ariano Suassuna
- Arica y Parinacota Region
- Arica
- Ariccia
- Aricini
- Arieh
- Ariel (angel)
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- Aries (constellation)
- Arikara
- Arimaspi
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- ARINC 429
- Arinos River
- Ariobarzanes
- Ariosophy
- Ariq Böke
- Aristaenetus
- Aristander
- Aristida
- Aristide Briand
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- Aristides Quintilianus
- Aristides Royo
- Aristo of Chios
- Aristo of Pella
- Aristobulus of Alexandria
- Aristobulus of Cassandreia
- Aristocracy
- Aristolochia sipho
- Aristomenes
- Aristonicus of Alexandria
- Aristotelian ethics
- Aristotelianism
- Aristotle
- Aristoxenus
- Arisugawa-no-miya
- Arithmetic function
- Arithmetic logic unit
- Arithmetic mean
- Arithmetic progression
- Arithmetic
- Arithmetical hierarchy
- Ariwara no Narihira
- Arizona bark scorpion
- Arizona
- Arizonasaurus
- Arjuna
- Ark clam
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- Arkady Raikin
- Arkady Vorobyov
- Arkansas River
- Arkansas
- Arkhangelsk
- Arkle
- Arlington, Texas
- ARM architecture family
- Arm
- Armadillo
- Armageddon
- Armand Carrel
- Armand de Bourbon, Prince of Conti
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- Armand de Kersaint
- Armand de Pontmartin
- Armand de Vignerot du Plessis
- Armand Fallières
- Armand Gensonné
- Armand Jean le Bouthillier de Rancé
- Armand Louis de Gontaut
- Armand Marc, comte de Montmorin
- Armand-Augustin-Louis de Caulaincourt
- Armand-Emmanuel de Vignerot du Plessis, duc de Richelieu
- Armand-Gaston Camus
- Armand-Pierre Caussin de Perceval
- Armando Carlini
- Armando Diaz
- Armando Palacio Valdés
- Armas Järnefelt
- Armatoloi
- Armature (electrical)
- Armed Forces Provisional Ruling Council
- Armenia
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- Armenian chant
- Armenian genocide denial
- Armenian genocide
- Armenian Kingdom of Cilicia
- Armenian language
- Armenian literature
- Armenian question
- Armentières
- Armeria
- Armet
- Armidale
- Armillary sphere
- Armilus
- Ármin Vámbéry
- Arminianism
- Armistice Day
- Armistice of Mudanya
- Armoni and Mephibosheth
- Armor-piercing bullet
- Armorican Massif
- Armour of the Kelly gang
- Armour-piercing ammunition
- Armour
- Armoured personnel carrier
- Armoured warfare
- Arms control
- Arms race
- Armstead
- Army ant
- Army
- Arnail François, marquis de Jaucourt
- Arnal
- Arnaldus de Villa Nova
- Arnaud du Ferrier
- Arnaud Guillaume de Barbazan
- Arnaud-Michel d'Abbadie
- Arnauld de Oihenart
- Arnault
- Arnaut de Mareuil
- Arndt
- Arne Garborg
- Arnebia
- Arneth
- Arnhem Land
- Arno Holz
- Arno of Salzburg
- Arnobius the Younger
- Arnobius
- Arnold (surname)
- Arnold Böcklin
- Arnold Brecht
- Arnold Daly
- Arnold Drakenborch
- Arnold Escher von der Linth
- Arnold Fitz Thedmar
- Arnold Henry Guyot
- Arnold Hermann Ludwig Heeren
- Arnold Houbraken
- Arnold Pannartz and Konrad Sweynheim
- Arnold Sommerfeld
- Arnold van Keppel, 1st Earl of Albemarle
- Arnold von Lasaulx
- Arnold von Winkelried
- Arnolfini Portrait
- Arnošt Lustig
- Arnoul d'Audrehem
- Arnoul Gréban
- Arnstadt
- Aro people
- Aromatic compound
- Aromaticity
- Around the World in Eighty Days
- Arp 220
- Arpad, Syria
- ARPANET
- Arpeggio
- Arpent
- Arpi
- Arpino
- Arqa
- Arquà Petrarca
- Arquebus
- Arques-la-Bataille
- Arrábida Bridge
- Arrábida Natural Park
- Arrack
- Arrah
- Arrangement
- Arras lace
- Arrastra
- Array data structure
- Arrest warrant
- Arrest
- Arrestment
- Arrhenius equation
- Arris
- Arrondissement
- Arrow keys
- Arrow pushing
- Arrow's impossibility theorem
- Arrow
- Arrowhead
- Arrowroot
- Arroyo (creek)
- Ars-sur-Moselle
- Arsaces I of Parthia
- Arsène Darmesteter
- Arsène Houssaye
- Arsène Lupin
- Arsène Pujo
- Arsenic
- Arsenio Martínez Campos
- Arsenios Autoreianos
- Arsenius
- Arsine
- Arsinoe I
- Arsinoitherium
- Arsis and thesis
- Arson
- Arsonval
- Arsure-Arsurette
- Art and culture law
- Art and part
- Art auction
- Art Deco
- Art Gallery of Ontario
- Art history
- Art Institute of Chicago
- Art movement
- Art museum
- Art music
- Art Nouveau
- Art of Mathura
- Art of Mesopotamia
- Art rock
- Art school
- Art theft
- Art world
- Art
- Artabanus I of Parthia
- Artabanus II of Parthia
- Artabanus III of Parthia
- Artabanus IV of Parthia
- Artamon Matveyev
- Artaphernes
- Artavasdes II of Armenia
- Arte Povera
- Artem
- Artemas
- Artemidorus
- Artemis and the Stag
- Artemis
- Artemisa
- Artemisia (plant)
- Artemisia abrotanum
- Artemisia Gentileschi
- Artemisia umbelliformis
- Artemon
- Artemy Volynsky
- Artena
- Arteriosclerosis
- Artern
- Artery
- Artesian aquifer
- Arthashastra
- Arthracanthida
- Arthritis
- Arthrodira
- Arthropathy
- Arthropleura
- Arthropod
- Arthur Agarde
- Arthur Annesley, 1st Earl of Anglesey
- Arthur Balfour
- Arthur Benjamin
- Arthur Blomfield
- Arthur Bourchier
- Arthur Bowen Davies
- Arthur Brisbane
- Arthur Capell, 1st Baron Capell of Hadham
- Arthur Capell, 1st Earl of Essex
- Arthur Chichester, 1st Baron Chichester
- Arthur Cleveland Coxe
- Arthur Coke Burnell
- Arthur Collier
- Arthur Cronquist
- Arthur Cushman McGiffert
- Arthur de Montauban
- Arthur Dobbs
- Arthur Elphinstone, 6th Lord Balmerino
- Arthur Erdélyi
- Arthur F. Bentley
- Arthur F.E. van Schendel
- Arthur Fitzwilliam Tait
- Arthur Fleming (electrical engineer)
- Arthur Foote
- Arthur Giry
- Arthur Godfrey's Talent Scouts
- Arthur Golding
- Arthur Goring Thomas
- Arthur Haselrig
- Arthur Heygate Mackmurdo
- Arthur Hinsley
- Arthur Hobhouse, 1st Baron Hobhouse
- Arthur Hood, 1st Baron Hood of Avalon
- Arthur Hugh Clough
- Arthur I. Boreman
- Arthur III, Duke of Brittany
- Arthur Kill Bridge
- Arthur Kill
- Arthur Kingsley Porter
- Arthur Kopit
- Arthur Krock
- Arthur Lee, 1st Viscount Lee of Fareham
- Arthur M. Banta
- Arthur M. Schlesinger Jr.
- Arthur M. Schlesinger Sr.
- Arthur MacMurrough Kavanagh
- Arthur Melville
- Arthur Morrison
- Arthur Nikisch
- Arthur Oncken Lovejoy
- Arthur Peel, 1st Viscount Peel
- Arthur Penn
- Arthur Pue Gorman
- Arthur Purves Phayre
- Arthur Quiller-Couch
- Arthur Ranc
- Arthur Richard Dillon
- Arthur Rimbaud
- Arthur Rudolf Hantzsch
- Arthur Saint-Léon
- Arthur Siegel
- Arthur Sullivan
- Arthur Symons
- Arthur Upfield
- Arthur Vineberg
- Arthur Wellesley, 1st Duke of Wellington
- Arthur Winnington-Ingram
- Arthur Woolf
- Artibonite River
- Artichoke
- Article (grammar)
- Articles of Confederation
- Articulata (Crinoidea)
- Articulated bus
- Articulation (music)
- Artificial general intelligence
- Artificial intelligence
- Artificial island
- Artificial language
- Artificial leather
- Artificial life
- Artificial neural network
- Artificial organ
- Artificial plants
- Artillery
- Artist's book
- Artist
- Arts and Crafts movement
- Arts journalism
- ArtScience Museum
- Artuqids
- Artúr Görgei
- Artur Lundkvist
- Arturo Graf
- Arturo Martini
- Aru Islands Regency
- Aruba
- Arumah
- Arunachal Pradesh
- Arusha
- Arusianus Messius
- Arval Brethren
- Arvals
- Arvid August Afzelius
- Arvid Horn
- Arvida, Quebec
- Arwad
- Ary Scheffer
- Aryan race
- Aryeh Leon Kubowitzki
- Aryl
- Arza
- Arzamas Society
- Arzamas
- As I Lay Dying
- As the World Turns
- As You Like It
- As-Suwayda
- Asa Packer
- Asada Goryu
- Asaf-ud-Daula
- Asafoetida
- Asahel
- Asahikawa
- Asaiah
- Asan
- Asansol
- Asatru Folk Assembly
- Asbestos
- Asbestosis
- ASC X12
- Ascariasis
- Ascaris lumbricoides
- Ascension Island
- Ascension of Isaiah
- Ascension of Jesus
- Asceticism
- Ascetosporea
- Aschelminth
- Ascher
- Aschersleben
- Asciano
- Ascidiacea
- ASCII art
- ASCII
- Ascitans
- Asclepiades of Bithynia
- Asclepiades of Samos
- Asclepias
- Ascomycota
- Asconius Pedianus
- Ascus
- ASDE-X
- ASEAN
- Asellota
- Asenovgrad
- Asexual reproduction
- Asgard
- Ash (analytical chemistry)
- Ash Wednesday
- Ash'ari
- Ash
- Asha Bhosle
- Asháninka
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- Asharaf
- Ashbel
- Ashdod
- Ashendene Press
- Asher ben Jehiel
- Asher
- Asherah
- Ashgabat
- Ashkenaz
- Ashlar
- Ashley Eden
- Ashoka
- Ashokan Reservoir
- Ashraf (name)
- Ashta Pradhan
- Ashteroth Karnaim
- Ashton-under-Lyne
- Ashur (Bible)
- Ashur (god)
- Ashura
- Ashuradeh
- Ashurnasirpal II
- Asia-Pacific Economic Cooperation
- Asia
- Asian barbet
- Asian black bear
- Asian Civilisations Museum
- Asian Development Bank
- Asian elephant
- Asian giant hornet
- Asian Highway Network
- Asian water monitor
- Asiatic linsang
- Asiatic lion
- Asiatic Low
- Asiatic salamander
- Aşıkpaşazade
- Askaryan radiation
- Askaules
- Askeri
- Askiya Dynasty
- AskSam
- Asmara
- ASML Holding
- Asmodeus
- Asmus Jacob Carstens
- Asnières-sur-Seine
- Asolo
- Asor
- Asparagine
- Asparagus aethiopicus
- Asparagus setaceus
- Asparagus
- Aspartic acid
- Aspasius
- Aspen Music Festival and School
- Aspen
- Aspendos
- Asperger syndrome
- Asperges
- Aspergillus
- Asperula
- Asphalt concrete
- Asphalt
- Asphaltite
- Asphyxia
- Aspidorhynchiformes
- Aspirin
- Aspleniaceae
- Asrava
- Assam
- Assamese language
- Assassination of Abraham Lincoln
- Assassination of Archduke Franz Ferdinand
- Assassination of James A. Garfield
- Assassination of John F. Kennedy
- Assassination of Jovenel Moïse
- Assassination of Julius Caesar
- Assassination of Martin Luther King Jr.
- Assassination of Qasem Soleimani
- Assassination of Spencer Perceval
- Assassination of Uthman
- Assassination of William McKinley
- Assassination
- Assault (tort)
- Assault rifle
- Assault
- Assay
- Assegai
- Asselar man
- Assemani
- Assembled gem
- Assembly language
- Assembly line
- Asser
- Asset
- Assignment (computer science)
- Assignment (law)
- Assignment problem
- Assimilation (phonology)
- Assiniboine
- Assinie-Mafia
- Assise
- Assisi
- Assisted-opening knife
- Assize of Northampton
- Assmannshausen
- Associated Press
- Associated state
- Associated Universities, Inc.
- Association des États Généraux des Étudiants de l'Europe
- Association football
- Association for Computing Machinery
- Association of ideas
- Association of Information Technology Professionals
- Association of Personal Computer User Groups
- Association of Shinto Shrines
- Association of Software Professionals
- Associative array
- Associative property
- Assos
- Assumpsit
- Assumption of Moses
- Assur
- Assyria
- Assyrian sculpture
- Assyriology
- Astacus astacus
- Astatine
- Asteraceae
- Asteriornis
- Asterism (astronomy)
- Asterism (gemology)
- Asterius of Cappadocia
- Asterix
- Asteroid belt
- Asteroid
- Asteroseismology
- Asthenosphere
- Asthma
- Astigmatism
- Astley Cooper Key
- Astley Cooper
- Aston Manor
- Astoria–Megler Bridge
- Astragal
- Astrakhan
- Astral projection
- Astral Weeks
- Astrapotherium
- Astrid Lindgren
- Astro Boy (character)
- Astro Boy
- Astrobiology
- Astrochemistry
- Astrolabe
- Astrological aspect
- Astrological sign
- Astrology
- Astrometry
- Astronaut
- Astronomer
- Astronomical Almanac
- Astronomical catalog
- Astronomical coordinate systems
- Astronomical filter
- Astronomical interferometer
- Astronomical object
- Astronomical radio source
- Astronomical seeing
- Astronomical spectroscopy
- Astronomical system of units
- Astronomical transit
- Astronomical unit
- Astronomy & Astrophysics
- Astronomy
- Astrophotography
- Astrophysical maser
- Astrophysical X-ray source
- Astrophysics Data System
- Astrophysics
- Asturias
- Astyages
- Astylar
- Astypalaia
- Asunción
- Asus Eee PC
- Asus
- Aswan Dam
- Aswan Governorate
- Aswan
- Asymmetric warfare
- Asymptote
- Asymptotic analysis
- Asymptotic giant branch
- Asynchronous circuit
- Asyut Governorate
- Asyut
- AT (form factor)
- At the Moulin Rouge, The Dance
- AT&T
- Atacama Desert
- Atacama Large Millimeter Array
- Atacama Region
- Atacamite
- Atakapa
- Atanasoff–Berry computer
- Atargatis
- Atatürk Dam
- Ataxia
- Atchafalaya River
- Aten
- Ateste
- Athabasca River
- Athabaskan languages
- Athalaric
- Athanase Josué Coquerel
- Athanase Laurent Charles Coquerel
- Athanasios Christopoulos
- Athari
- Athaulf
- Atheism
- Atheist feminism
- Athena Parthenos
- Athena Promachos
- Athena
- Athenaeum Portrait
- Athens Metro
- Athens
- Atherosclerosis
- Athi-Galana-Sabaki River
- Athlete's foot
- Athletics (physical culture)
- Atilius Fortunatianus
- Atlanta
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- Atlantic canary
- Atlantic Charter
- Atlantic City, New Jersey
- Atlantic coastal plain
- Atlantic hurricane season
- Atlantic Ocean
- Atlantic Revolutions
- Atlantic slave trade
- Atlantis
- Atlas (architecture)
- Atlas (computer)
- Atlas (mythology)
- Atlas Mountains
- Atlas Shrugged
- Atlas
- Ātman (Hinduism)
- Atmosphere of Earth
- Atmosphere of Jupiter
- Atmosphere of Mars
- Atmosphere of Mercury
- Atmosphere of Pluto
- Atmosphere of Uranus
- Atmosphere of Venus
- Atmosphere
- Atmospheric circulation
- Atmospheric electricity
- Atmospheric optics
- Atmospheric physics
- Atmospheric pressure
- Atmospheric science
- Atoll
- Atolls of the Maldives
- Atom cluster
- Atom
- Atomic absorption spectroscopy
- Atomic Age
- Atomic battery
- Atomic bombings of Hiroshima and Nagasaki
- Atomic clock
- Atomic emission spectroscopy
- Atomic formula
- Atomic mass
- Atomic nucleus
- Atomic number
- Atomic orbital
- Atomic packing factor
- Atomic physics
- Atomic radius
- Atomic spectroscopy
- Atomic theory
- Atomism
- Atonality
- Atonement (novel)
- ATPase
- Atrato River
- Atrato
- Atrek
- Atriplex hortensis
- Atrium (heart)
- Atropa belladonna
- Atropatene
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- ATSC standards
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- Attack on Pearl Harbor
- Attack on Titan
- Attalea speciosa
- Attempt
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- Attention
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- Atterbury
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- Attock
- Attorney at law
- Attornment
- Attosecond
- Attractor
- Attu Island
- Attus Navius
- Atum
- Au Hasard Balthazar
- Aubrey Thomas de Vere
- Aubrieta
- Auburn system
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- Auchmuty
- Auckland Harbour Bridge
- Auckland Islands
- Auckland Region
- Auckland
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- Audefroi le Bastart
- Audianism
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- Audio and video interfaces and connectors
- Audio coding format
- Audio Interchange File Format
- Audio watermark
- Audiology
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- Audit
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- Aue
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- Augmented reality
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- Augustus Pitt Rivers
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- Augustus
- Auk
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- Aurangabad
- Aurangzeb
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- Aurinia saxatilis
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- Auschwitz concentration camp
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- Ausonius
- Austen Henry Layard
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- Australopithecine
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- Australopithecus africanus
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- Australopithecus sediba
- Australopithecus
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- Author
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- AVE
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- Avoirdupois system
- Avon, New York
- AvtoVAZ
- Avulsion (river)
- Avulsion injury
- Awadia and Fadnia tribes
- Awaji Island
- Awash River
- Away in a Manger
- Ax-les-Thermes
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- Axiom of extensionality
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- Axiom schema of specification
- Axiom schema
- Axiom
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- Aymara language
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- Ayvalık
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- Az Zubayr
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- Azerbaijan
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- Aztec architecture
- Aztec Empire
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- Aztec sun stone
- Aztecs
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- Azulejo
- Azure (color)
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- B cell
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- Babylon
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- Babylonian captivity
- Babylonian law
- Bắc Ninh
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- Baccio Bandinelli
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- Baccio
- Bach family
- Bạch Long Vĩ Island
- Bacharach
- Bache Peninsula
- Bachelor of Arts
- Bachelor of Science
- Bachelor's degree
- Bacillus subtilis
- Bacillus
- Back in Black
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- Back to the Future
- Back-arc basin
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- Backfeeding
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- Background radiation
- Backnang
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- Backup software
- Backup
- Backus–Naur form
- Backward-wave oscillator
- Bacolod
- Bacon (name)
- Bacon's Rebellion
- Bács-Kiskun County
- Bacteria
- Bacterial capsule
- Bacterial cell structure
- Bacterial genetics
- Bacterial taxonomy
- Bacteriophage
- Bactria
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- Bad Alexandersbad
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- Badulla
- Baekje
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- Baffin Island
- Bafia
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- Bag
- Bagamoyo
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- Baghal State
- Baghdad Pact
- Baghdad School
- Baghdad
- Bagheera kiplingi
- Bagillt
- Bagimonds Roll
- Baglioni family
- Bagmati River
- Bagnères-de-Bigorre
- Bagnères-de-Luchon
- Bagni di Lucca
- Bagnold number
- Bago, Myanmar
- Bagoas
- Bagpipes
- Bagratid Armenia
- Bagshot Formation
- Baguida
- Baguio
- Bagutta Prize
- Bagyidaw
- Baha ad-Din ibn Shaddad
- Baha al-Din Zuhayr
- Baha' al-din al-'Amili
- Bahadur Khel
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- Bahariya Oasis
- Bahawalnagar
- Bahawalpur
- Baháʼí Faith
- Bahía Blanca
- Bahia
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- Bahr el Zeraf
- Bahraich
- Bahrain Island
- Bahrain
- Bahram Chobin
- Bahram I
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- Bahram III
- Bahram IV
- Bahram V
- Bahubali
- Bahurim
- Bahut
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- Bai Bureh
- Baia
- Baidu
- Baiji
- Baikal Nature Reserve
- Baikie
- Baikonur Cosmodrome
- Bail
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- Bailey Willis
- Bailie
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- Bailo
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- Bairiki
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- Baixada Fluminense
- Baiyue
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- Baja California Sur
- Baja California
- Bajaur District
- Bajío
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- Bak file
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- Baker Island
- Bakersfield, California
- Bakewell Glass
- Bakhchysarai
- Bakhmut
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- Bakony
- Bakoy River
- Baku Archipelago
- Baku
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- Bal du moulin de la Galette
- Bala, Gwynedd
- Balaam
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- Balaghat Range
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- Balance of nature
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- Balarama
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- Bald eagle
- Baldassare d'Anna
- Baldassare Franceschini
- Baldassare Peruzzi
- Baldomero Espartero
- Baldr
- Baldric of Dol
- Balearic Islands
- Baleen whale
- Baler
- Bales
- Balfour Declaration
- Balfour Stewart
- Balhae
- Bali Kingdom
- Bali
- Balibo Five
- Balikpapan
- Balinese cat
- Bálint Balassi
- Baliqiao
- Baliuag
- Balıkesir
- Balkan Mountains
- Balkan music
- Balkan Pact
- Balkan Wars
- Balkans campaign (World War II)
- Balkans theatre
- Balkans
- Balkhash (city)
- Balkline
- Ball cactus
- Ball flower
- Ball joint
- Ball lightning
- Ball mill
- Ball python
- Ball-and-stick model
- Ball's Bluff Battlefield and National Cemetery
- Ballad
- Ballades (Chopin)
- Ballarat East, Victoria
- Balleny Islands
- Ballet Comique de la Reine
- Ballet d'action
- Ballet dancer
- Ballet Folklórico de México
- Ballet Russe de Monte-Carlo
- Ballet technique
- Ballet
- Ballets Russes
- Ballia
- Ballista
- Ballistic pendulum
- Ballistics
- Ballistocardiography
- Ballistospore
- Balloon (aeronautics)
- Ballroom dance
- Ballston Spa, New York
- Balmer series
- Balneotherapy
- Balochistan, Pakistan
- Balquhidder
- Balrampur
- Balsas River
- Balsham
- Baltasar Alamos de Barrientos
- Baltasar Brum
- Baltasar Gracián
- Baltasar Lopes da Silva
- Balthasar Bekker
- Balthasar de Beaujoyeulx
- Balthasar van der Pol
- Baltic area runestones
- Baltic Entente
- Baltic mythology
- Baltic Sea
- Baltic states
- Baltica
- Baltimore crisis
- Baltimore
- Baltistan
- Balto
- Baltra Island
- Baluster
- Bamako
- Bamana Empire
- Bambara language
- Bambatha Rebellion
- Bamberg
- Bamboccianti
- Bamboo Annals
- Bamboo Harvester
- Bamboo shoot
- Bamboo
- Bamenda
- Bampur
- Bamra State
- Ban (title)
- Banach space
- Banach–Tarski paradox
- Banaganapalli
- Banality (sculpture series)
- Banana pepper
- Banana slug
- Banana Wars
- Banana
- Bananaquit
- Bananas in Pyjamas
- Banastre Tarleton
- Banat
- Banc d'Arguin National Park
- Banco Santander
- Band gap
- Band-e Amir National Park
- Band-pass filter
- Banda Aceh
- Bandar Abbas
- Bandar Lampung
- Bandar Lengeh
- Bandar Seri Begawan
- Bande dessinée
- Banded bullfrog
- Banded iron formation
- Banded knifefish
- Banded palm civet
- Bandenbekämpfung
- Bandera, Texas
- Banderole
- Bandicoot
- Bandiera brothers
- Bandırma
- Bandung
- Banff National Park
- Bánffy
- Bangalore
- Bangka Belitung Islands
- Bangkok
- Bangladesh Liberation War
- Bangladesh
- Bangsamoro
- Bangui
- Banjarmasin
- Banjo
- Banjul
- Bank for International Settlements
- Bank holiday
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- Bank robbery
- Bank teller
- Bank vault
- Bank War
- Bank
- Bankim Chandra Chatterjee
- Bankipore
- Banknote
- Bankruptcy
- Banks Island
- Banks Islands
- Banksia
- Banner
- Bannu
- Banpo Bridge
- Banshee
- Banská Štiavnica
- Banswara
- Banten
- Banteng
- Bantu expansion
- Bantu languages
- Bantu peoples
- Bantustan
- Banu Hilal
- Baoding
- Baoji
- Baotou
- Baptism
- Baptistery
- Baptists
- Baqubah
- Bar (law)
- Bar (music)
- Bar (river morphology)
- Bar (unit)
- Bar council
- Bar examination
- Bar Hebraeus
- Bar-le-Duc
- Bar-sur-Aube
- Bar-sur-Seine
- Bar, Montenegro
- Barabanki
- Barabra
- Barack Obama "Hope" poster
- Barada
- Barakaldo
- Baranya County
- Barasat
- Barbacena
- Barbados
- Barbara von Krüdener
- Barbary dove
- Barbary lion
- Barbary pirates
- Barbary sheep
- Barbecue grill
- Barberini family
- Barbershop music
- Barbital
- Barbiton
- Barbizon
- Barbra Streisand
- Barbuda
- Barcelona Metro
- Barcelona
- Barcode
- Bardaisan
- Bardhaman
- Bardiya
- Bardo Thodol
- Bardo
- Barea Soranus
- Barèges
- Bareilly
- Barentin
- Barents Sea
- Barfleur
- Barge Haulers on the Volga
- Barge
- Bargeboard
- Barghest
- Bari
- Bariloche
- Barisal Division
- Barisal
- Baritone
- Barium carbonate
- Barium manganate
- Barium permanganate
- Barium peroxide
- Barium
- Bark (botany)
- Barkly East
- Barkly West
- Barley-Break
- Barley
- Barleycorn (unit)
- Barm
- Barmakids
- Barmote court
- Barn (unit)
- Barn owl
- Barn swallow
- Barn
- Barnabe Barnes
- Barnabe Googe
- Barnaby Bernard Lintot
- Barnacle
- Barnard's Star
- Barnardo
- Barnaul
- Barnes Peacock
- Barney & Friends
- Baroda State
- Barometer
- Barometric light
- Baron Arundell of Wardour
- Baron Auckland
- Baron d'Holbach
- Baron Dover
- Baron Franz von der Trenck
- Baron Lexinton
- Baron Methuen
- Baron Mountjoy
- Baron North
- Baron Samedi
- Baron Talbot
- Baron Walpole
- Baron Widdrington
- Baron Zouche
- Baron
- Baroque architecture
- Baroque music
- Baroque sculpture
- Baroque
- Barotac Nuevo
- Barotropic fluid
- Barotropic vorticity equation
- Barouche
- Barquisimeto
- Barra do Piraí
- Barra Mansa
- Barrackpore mutiny of 1824
- Barrackpore
- Barracuda
- Barranquilla
- Barred spiral galaxy
- Barrel (unit)
- Barrel organ
- Barrel piano
- Barrel vault
- Barrel
- Barreleye
- Barremian
- Barren Grounds
- Barrett Wendell
- Barricade
- Barrier island
- Barrier Treaty
- Barrington Moore Jr.
- Barrister
- Barristers' chambers
- Barrois
- Barry Bonds
- Barry Byrne
- Barry Pain
- Barry Sullivan (stage actor)
- Barry Yelverton, 1st Viscount Avonmore
- BARS apparatus
- Barsi
- Barṣīṣā
- Barstovian
- Bart Simpson
- Bart the Bear 2
- Bart the Bear
- Bartender
- Barthélemy d'Herbelot
- Barthélemy Faujas de Saint-Fond
- Barthélemy Hauréau
- Barthélemy-Prosper Enfantin
- Barthélemy
- Barthold Georg Niebuhr
- Bartholomeus Anglicus
- Bartholomeus Spranger
- Bartholomew Badlesmere, 1st Baron Badlesmere
- Bartholomew Burghersh the elder
- Bartholomew Burghersh the younger
- Bartholomew Legate
- Bartholomew Price
- Bartizan
- Bartın Province
- Bartolomé Bermejo
- Bartolomé Carranza
- Bartolomé de Medina (theologian)
- Bartolomé de Torres Naharro
- Bartolomé Leonardo de Argensola
- Bartolomé Ordóñez
- Bartolomeo Ammannati
- Bartolomeo Borghesi
- Bartolomeo Carducci
- Bartolomeo Colleoni
- Bartolomeo Montagna
- Bartolomeo Vivarini
- Bartolomeu Dias
- Bartolus de Saxoferrato
- Barton Beds
- Barton Booth
- Bartonellosis
- Bartonian
- Bartoszyce
- Bartramia pomiformis
- Barugo
- Baruni
- Baruta Municipality
- Barycenter
- Barylambda
- Baryogenesis
- Baryon acoustic oscillations
- Baryon asymmetry
- Baryon number
- Baryon
- Baryonyx
- Baryte
- Barytocalcite
- Barytone
- Basal shoot
- Basal sliding
- Basalt
- Basawan
- Bascinet
- Base (chemistry)
- Base anhydride
- Base fee
- Base level
- Base load
- Base metal
- Base pair
- Baseball
- Baseband
- Basel-Landschaft
- Basel-Stadt
- Basel
- Baselining
- Basement (geology)
- Basement membrane
- Basement
- BASF
- Bashford Dean
- Bashir Shihab II
- Bashir Tofa
- Bashkir language
- Bashkirs
- Bashkortostan
- Bashu culture
- Basic English
- Basic lead phosphite
- Basic oxygen steelmaking
- Basic Rate Interface
- Basic research
- BASIC
- Basidiomycota
- Basidium
- Basil (name)
- Basil Faber
- Basil Feilding, 2nd Earl of Denbigh
- Basil I
- Basil Lanneau Gildersleeve
- Basil Lekapenos
- Basil of Ancyra
- Basil
- Basilan
- Basilian monks
- Basilica of Maxentius
- Basilica
- Basilicata
- Basílio da Gama
- Basiliscus (lizard)
- Basilisk
- Basilosaurus
- Basin and Range Province
- Basirhat
- Başkale
- Basket star
- Basket weaving
- Basket
- Basketball
- Basking shark
- Basmala
- Basoche
- Basohli (town)
- Basommatophora
- Basophil
- Basque Country (autonomous community)
- Basque language
- Basques
- Basra
- Bass (fish)
- Bass (sound)
- Bass (voice type)
- Bass drum
- Bass guitar
- Bass Otis
- Bass Strait
- Bassari people
- Bassaricyon
- Basse-taille
- Basse-Terre
- Basseterre
- Bassoon
- Bast fibre
- Bastam
- Bastarnae
- Bastet
- Bastiano da Sangallo
- Bastide
- Bastion fort
- Bastion
- Bat-eared fox
- Bat
- Batac
- Batahin
- Batak
- Batala
- Batam
- Batanes
- Batch processing
- Batch production
- Batch reactor
- Bateleur
- Bath chair
- Bathers at Asnières
- Bathinda
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- Bathurst Island (Northern Territory)
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- Bathvillite
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- Batman (TV series)
- Batman: The Animated Series
- Batman
- Batna (city)
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- Baton Rouge, Louisiana
- Baton round
- Batrachoididae
- Batrachomyomachia
- Batta
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- Battle of Ctesiphon (363)
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- Battle of France
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- Battle of Majuba Hill
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- Battle of Megiddo (15th century BC)
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- Battle of Midway
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- Battle of Mogadishu (1993)
- Battle of Mont Sorrel
- Battle of Myeongnyang
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- Battle Royale (film)
- Battle
- Battledore and shuttlecock
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- Battleship
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- Bayonet
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- Bazaine
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- BBC World News
- BBC
- Be My Baby
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- Beacon, New York
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- Beagle
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- Beaked whale
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- Beaufort Sea
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- Beauly
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- Beauty and the Beast (1991 film)
- Beauty and the Beast
- Beauty
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- Beer
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- Behavior
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- Beijing Subway
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- Being
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- Benin
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- Benjamin Curtis Porter
- Benjamin F. Tracy
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- Benjamin Franklin Stevens
- Benjamin Godard
- Benjamin Hall Kennedy
- Benjamin Haydon
- Benjamin Heath
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- Benjamin of Tudela
- Benjamin Robins
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- Benjamin Thorpe
- Benjamin Whichcote
- Benjamin, Duke of Soubise
- Benoît de Boigne
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- Benozzo Gozzoli
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- Bent molecular geometry
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- Beowulf
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- Berbers
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- Bering Strait
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- Berkeley Moynihan, 1st Baron Moynihan
- Berkeley Open Infrastructure for Network Computing
- Berkelium
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- Berlin Painter
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- Bernard Burke
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- Bernard Lovell
- Bernard Mills
- Bernard Mizeki
- Bernard O'Dowd
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- Bernard Ogilvie Dodge
- Bernard Palissy
- Bernard Partridge
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- Bernard Saisset
- Bernard Sarrette
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- Bernard Wefers
- Bernardas Brazdžionis
- Bernardim Ribeiro
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- Bernardino Telesio
- Bernardo Accolti
- Bernardo Castello
- Bernardo Daddi
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- Bernardo Pasquini
- Bernardo Santareno
- Bernardo Tasso
- Bernardo Vittone
- Bernat Metge
- Bernays
- Bernburg
- Bernese Alps
- Bernhard Bang
- Bernhard Dernburg
- Bernhard Egidius Konrad ten Brink
- Bernhard Ernst von Bülow
- Bernhard Gillam
- Bernhard Kellermann
- Bernhard Knipperdolling
- Bernhard Molique
- Bernhard Siegfried Albinus
- Bernhard Stade
- Bernhard Studer
- Bernhard von Beskow
- Bernhard von Bülow
- Bernhard von Cotta
- Bernhard von Langenbeck
- Bernhard Walther
- Bernhard Weiss
- Bernhardus Varenius
- Bernician Series
- Bernkastel-Kues
- Bernoulli's principle
- Beroea
- Beroidae
- Berothah
- Beroun
- Berry (botany)
- Berry
- Berta people
- Bertel Thorvaldsen
- Bertha von Suttner
- Berthold Laufer
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- Bertholet Flemalle
- Bertin
- Bertinoro
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- Bertoldo di Giovanni
- Bertram Boltwood
- Bertram Eugene Warren
- Bertrand Andrieu
- Bertrand Barère
- Bertrand Clauzel
- Bertrand de Salignac de la Mothe-Fénelon
- Bertrand-François Mahé de La Bourdonnais
- Bertrand's theorem
- Beryl
- Beryllium carbide
- Beryllium copper
- Beryllium
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- Beryozovsky, Sverdlovsk Oblast
- Berytus
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- Bess Streeter Aldrich
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- Best current practice
- BEST theorem
- Best-effort delivery
- Bestiary
- BET theory
- Beta Centauri
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- Beta particle
- Beta Pictoris
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- Betaine
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- Bethoron
- Betje Wolff
- Betrayal
- Bettani
- Bette Davis
- Better Homes and Gardens (magazine)
- Betterment
- Bettiah
- Bettina von Arnim
- Bettino Ricasoli
- Betty Boop
- Betul, Madhya Pradesh
- Betula nigra
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- Betula pendula
- Betwa River
- Between Scylla and Charybdis
- Betws-y-Coed
- Bevel
- Beverly Hills, 90210
- Bevil Grenville
- Bevis of Hampton
- Bewitched
- Bey
- Beyond Good and Evil
- Beypazarı, Ankara
- Bezantée
- Bezhetsk
- Bézout's identity
- Bhabani Bhattacharya
- Bhabha scattering
- Bhadrabahu
- Bhagalpur
- Bhagavad Gita
- Bhagavata Purana
- Bhaiband
- Bhajan
- Bhakti yoga
- Bhambatha
- Bhamo
- Bhandara
- Bhander Plateau
- Bhangra (dance)
- Bharatanatyam
- Bharatiya Janata Party
- Bharatpur, Nepal
- Bharavi
- Bharhut
- Bhashya
- Bhatpara
- Bhattiana
- Bhau Daji
- Bhava
- Bhavnagar
- Bhedabheda
- Bheemunipatnam
- Bhikkhu
- Bhikkhunī
- Bhil
- Bhilai
- Bhilwara
- Bhimbetka rock shelters
- Bhishti
- Bhiwandi
- Bhojpuri language
- Bhola Island
- Bhopal State
- Bhopal
- Bhopawar Agency
- Bhor
- BHP
- Bhubaneswar
- Bhutan
- Bi-elliptic transfer
- Bi-metallic coin
- Bi-quinary coded decimal
- Biafra
- Biagio Marin
- Białowieża Forest
- Białowieża
- Białystok
- Bian Zhilin
- Bianca Cappello
- Biancaea sappan
- Bianchini
- Bias
- Biasing
- Bibescu
- Bible Christian Church
- Bible society
- Bible translations into English
- Bible
- Biblical and Talmudic units of measurement
- Biblical apocrypha
- Biblical canon
- Biblical hermeneutics
- Biblical mile
- Bibliography of The Holocaust
- Bibliography
- Biblioteca Nacional de España
- Bibliotheca Alexandrina
- Bibliothèque nationale de France
- Bibracte
- Bicameralism
- Bicarbonate
- Bice
- Bichir
- Bichitr
- Bicol Region
- Bicosoecida
- Bicycle boulevard
- Bicycle brake
- Bicycle gearing
- Bicycle parking rack
- Bicycle Thieves
- Bicycle-sharing system
- Bicycle
- Bida
- Biddeford, Maine
- Bidding prayer
- Bidet
- Bié Plateau
- Biel/Bienne
- Bielefeld
- Bielsko-Biała
- Bielsko
- Biên Hòa
- Bieri
- BIFF
- Bifocals
- Bifurcation theory
- Big band
- Big Bang nucleosynthesis
- Big Bang
- Big Ben
- Big Bend Ranch State Park
- Big Bertha (cow)
- Big Brother (American TV series)
- Big Brother (Nineteen Eighty-Four)
- Big Crunch
- Big Cypress National Preserve
- Big data
- Big Dipper
- Big History
- Big Hole
- Big O notation
- Big Rapids, Michigan
- Big Rip
- Big South Fork National River and Recreation Area
- Big-game hunting
- Bigfoot
- Bigg Boss
- Bighorn River
- Bighorn sheep
- Bigo bya Mugenyi
- Bigthan and Teresh
- Bihar
- Bihari Lal
- Bihari languages
- Bijapur
- Bijawar
- Bijection, injection and surjection
- Bijection
- Bijnor
- Bikaner
- Bike lane
- Bikini Atoll
- Bila Tserkva
- Bilala people
- Bilaspur State (princely state)
- Bilaspur, Chhattisgarh
- Bilateria
- Bilauktaung
- Bilbao
- Bilbo Baggins
- Bild
- Bilderberg meeting
- Bilecik
- Bilen people
- Bilgəh
- Bilhorod-Dnistrovskyi
- Bilinear interpolation
- Bilingual education
- Bill (law)
- Bill of Rights 1689
- Bill of rights
- Billbergia
- Billboard (magazine)
- Billet
- Billfish
- Billie Holiday
- Billie Jean King
- Billie Jean
- Billings, Montana
- Billy Budd
- Bilma
- Bilohirsk
- Biltong
- Bimini
- Binah (Kabbalah)
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- Biñan
- Binary file
- Binary logarithm
- Binary multiplier
- Binary number
- Binary pulsar
- Binary relation
- Binary search algorithm
- Binary search tree
- Binary star
- Binary Synchronous Communications
- Binary-code compatibility
- Binary-safe
- Bindery
- Binding energy
- Binding over
- Bingerbrück
- Bingham Canyon Mine
- Bingham plastic
- Binioù kozh
- Binnacle
- Binnya Dala
- Binoculars
- Binomial (polynomial)
- Binomial coefficient
- Binomial distribution
- Binomial nomenclature
- Binomial series
- Binomial theorem
- Binturong
- Binzhou
- Bioacoustics
- Bioarchaeology
- Bioaugmentation
- Biobío Province
- Biobío Region
- Biocentrism (ethics)
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- Bioelectromagnetics
- Bioelectronics
- Bioethics
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- Biogeochemistry
- Biogeographic realm
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- Biography
- Bioinformatics
- Bioleaching
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- Biological anthropology
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- Biological pigment
- Biological specificity
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- Biologicals
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- Biomedical engineering
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- Biomimetics
- Biomining
- Biomolecule
- Bion of Borysthenes
- Bioorganic chemistry
- Biopharmaceutical
- Biophoton
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- Biopsy
- Bioreactor
- Bioregionalism
- Bioremediation
- Biorheology
- BIOS
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- Biostimulation
- Biostratigraphy
- Biot–Savart law
- Biotechnology
- Biotelemetry
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- Biotic potential
- Biotin
- Biotite
- Bioturbation
- Biozone
- Bipartite graph
- Bipedalism
- Biphenyl
- Bipolar disorder
- Bipolar I disorder
- Bipolar II disorder
- Bipolar junction transistor
- Bipont Editions
- Bir el Ater
- Biratnagar
- Birbhum district
- Birch mouse
- Birch–Murnaghan equation of state
- Birch's law
- Birch
- Bird anatomy
- Bird in Space
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- Bird of prey
- Bird Woman Falls
- Bird-of-paradise
- Bird
- BirdLife International
- Birdwing
- Birecik
- Birefringence
- Birger
- Birgit Nilsson
- Birgunj
- Biribi
- Biritch
- Birjand
- Birkenfeld
- Birkenia
- Birman
- Birmingham Museum and Art Gallery
- Birmingham, Alabama
- Birmingham
- Birney
- Birnin Kebbi
- Birnin Kudu
- Birth control
- Birth
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- Bisanthe
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- Bischwiller
- Bisection method
- Bisection
- Bishari tribe
- Bishkek
- Bishop Auckland
- Bishop of Sodor and Man
- Bishop's Stortford
- Bishop
- Bishops' Wars
- Bishwa Ijtema
- Biskra
- Bislama
- Bismarck Archipelago
- Bismarck Sea
- Bismarck, North Dakota
- Bismuth
- Bismutite
- Bispectrum
- Bissau
- Bissextus
- Bissorã
- Bit Adini
- Bit blit
- Bit cell
- Bit manipulation
- Bit nibbler
- Bit plane
- Bit rate
- Bit slicing
- Bit-level parallelism
- Bit-oriented protocol
- Bit
- Bitches Brew
- Bitcoin
- Bite angle
- Bithoor
- Bithynia
- Bitlis
- Bitmap
- Bito
- Bitola
- Bitonto
- Bitter orange
- Bitter Springs Group
- Bitter taste evolution
- Bitterfeld
- Bittern
- Bitterroot
- BitTorrent (software)
- BitTorrent
- Bitwise operation
- Biu Plateau
- Bivalvia
- BIX
- Biysk
- Bizen ware
- Bizerte
- Bizimkiler
- Bjørnstjerne Bjørnson
- BL Lacertae object
- BL Lacertae
- Black and Tan Coonhound
- Black Arts Movement
- Black Beauty
- Black body
- Black Box Corporation
- Black Boy
- Black Buck
- Black bullhead
- Black caiman
- Black Canyon of the Gunnison National Park
- Black Caviar
- Black church
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- Black Data Processing Associates
- Black Death
- Black Drin
- Black dwarf
- Black Elk Peak
- Black fly
- Black Forest
- Black ghost knifefish
- Black Givenchy dress of Audrey Hepburn
- Black grouse
- Black Guard
- Black haw
- Black Hills
- Black hole
- Black Iberian pig
- Black Iris (painting)
- Black Isle
- Black Lives Matter
- Black magic
- Black mamba
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- Black metal
- Black Mirror
- Black Mountain (San Diego County, California)
- Black Paintings
- Black Panther (character)
- Black Panther Party
- Black people
- Black pepper
- Black Range
- Black rat
- Black rhinoceros
- Black River (Asia)
- Black Saturday bushfires
- Black screen of death
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- Black Square (painting)
- Black Stone
- Black stork
- Black swallower
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- Black turtle bean
- Black veil
- Black War
- Black Warrior River
- Black-and-white colobus
- Black-body radiation
- Black-eyed pea
- Black-headed gull
- Black–Scholes model
- Black
- Blackadder
- Blackberry
- Blackbuck
- Blackcurrant
- Blackdamp
- Blackface
- Blackitude Museum
- Blackleg (disease)
- Blacklight
- Blackmail
- BlackRock
- Blacktip shark
- Bladder pipe
- Bladdernut
- Blade Runner
- Blade
- Blagoveshchensk
- Blaise de Monluc
- Blame
- Blanch fee
- Blanche Lamontagne-Beauregard
- Blanche of Castile
- Blanchet (harpsichord makers)
- Blandford–Znajek process
- Blankenburg (Harz)
- Blanketeers
- Blantyre
- Blasius boundary layer
- Blasphemy law in the United Kingdom
- Blasphemy law
- Blasphemy
- Blass
- Blast furnace
- Blast wave
- Blastema
- Blastoid
- Blastulation
- Blastus
- Blaubeuren
- Blaye
- Blazar
- Blazed grating
- Bleach (manga)
- Bleach
- Bleak House
- Bleeding Kansas
- Bleeding
- Blended threat
- Blennerhassett Island
- Blennerhassett
- Blenniiformes
- Blepharochalasis
- Blera
- Blesmol
- Blessed Gerard
- Blessing
- Blida
- Blimp
- Blind fish
- Blind Harry
- Blinded experiment
- Blink comparator
- Bliss (image)
- Bliss Perry
- Blister agent
- Blister beetle
- Blitar
- Blizzard Entertainment
- Blizzard
- Bloch's theorem
- Block (periodic table)
- Block and tackle
- Block book
- Block cipher mode of operation
- Block cipher
- Blockade
- Blockbuster (entertainment)
- Bloemfontein
- Blog
- Blogger (service)
- Blonde lace
- Blonde on Blonde
- Blondi
- Blood agent
- Blood culture
- Blood donation
- Blood Meridian
- Blood orange
- Blood plasma
- Blood pressure
- Blood sugar level
- Blood test
- Blood transfusion
- Blood type
- Blood vessel
- Blood–brain barrier
- Blood
- Bloodfin tetra
- Bloodhound
- Bloods
- Bloodstream infections
- Bloody Saturday (photograph)
- Bloomberg Businessweek
- Bloomberg News
- Blossom algorithm
- Blowgun
- Blu-ray
- Blue and white pottery
- Blue book
- Blue crayfish
- Blue eared pheasant
- Blue giant
- Blue Heelers
- Blue Horses
- Blue hour
- Blue Island, Illinois
- Blue laser
- Blue monkey
- Blue Moon of Kentucky
- Blue Mountains (Pacific Northwest)
- Blue Nile
- Blue Origin
- Blue Peter
- Blue Ridge Mountains
- Blue shark
- Blue straggler
- Blue supergiant
- Blue Velvet (film)
- Blue whale
- Blue-collar worker
- Blue-ringed octopus
- Blue-throated motmot
- Blue-tongued skink
- Blue's Clues
- Blue
- Bluebeard
- Blueberry
- Bluecap
- Bluegrass music
- Blues
- Blueschist
- Bluestem grass
- Bluestone National Scenic River
- Bluetongue disease
- Bluetooth
- Blum axioms
- Blum's speedup theorem
- Blunt trauma
- Blurred vision
- BMP file format
- BMW
- BMX bike
- BNP Paribas
- Bo Bergman
- Bo, Sierra Leone
- Boa constrictor
- Boa Vista, Roraima
- Boar's Head Inn
- Board game
- Board of directors
- Boarding house
- Boarding school
- Boardman Robinson
- Boat-billed heron
- Boat
- Boatswain
- Bob and wheel
- Bob the Builder
- Bobak marmot
- Bobbili
- Bobbin lace
- Bobby McFerrin
- Bobcat
- Bobo-Dioulasso
- Boccanegra
- Bocchus I
- Bocchus II
- Bochum
- Bodacious (bull)
- Bodawpaya
- Bodenbach
- Bodh Gaya
- Bodhi Day
- Bodhicitta
- Bodhisattva
- Bodhivaṃsa
- Bodil Ipsen
- Bodily integrity
- Bodinayakkanur
- Bodle
- Bodleian Library
- Bodmer
- Body armor
- Body art
- Body fluid
- Body image disturbance
- Body language
- Body louse
- Body mass index
- Body modification
- Body odor
- Body of water
- Body piercing
- Body snatching
- Body text
- Boegoeberg Dam
- Boeing 707
- Boeing 727
- Boeing 737
- Boeing 747
- Boeing 757
- Boeing 767
- Boeing 777
- Boeing 787 Dreamliner
- Boeing B-29 Superfortress
- Boeing B-52 Stratofortress
- Boeing
- Boeotia
- Boer republics
- Boethus
- Boffille de Juge
- Bog iron
- Bog
- Boğazkale
- Bogeyman
- Bogomilism
- Bogor
- Bogorodsk
- Bogotá
- Bogra
- Bogumil Dawison
- Bogumil Goltz
- Bohai Sea
- Bohdan Khmelnytsky
- Bohemia
- Bohemian glass
- Bohemian Massif
- Bohemian Rhapsody
- Bohemian-Moravian Highlands
- Bohemium
- Bohemond I of Antioch
- Bohemond II of Antioch
- Böhmer
- Bohn
- Bohodukhiv
- Bohol
- Bohr magneton
- Bohr model
- Bohr radius
- Bohrium
- Bohuslav Martinů
- Boiardo
- Boidae
- Boiler (power generation)
- Boiler feedwater
- Boiler
- Boiling point
- Boiling-point elevation
- Boiling
- Bois-Brûlés
- Boise River
- Boise, Idaho
- Boissonade
- Bojnord
- Bok choy
- Bok globule
- Bokaro Steel City
- Bokmål
- Boknafjord
- Boko Haram insurgency
- Boko Haram
- Boksburg
- Bokuseki
- Bolama (town)
- Bolan Pass
- Bolaven Plateau
- Bolbec
- Bolero
- Boléro
- Bolesław Leśmian
- Boletus edulis
- Boleyn
- Bolgary
- Bolide
- Bolívar's campaign to liberate New Granada
- Bolivia
- Bolivian War of Independence
- Bolkhov
- Bologna
- Bolognese School
- Bolometric correction
- Bolsena
- Bolshevik Island
- Bolsheviks
- Bolshoi Ballet
- Bolshoy Lyakhovsky Island
- Bolshoy Ussuriysky Island
- Bolson
- Bolt action
- Bolton
- Boltonia asteroides
- Boltzmann constant
- Boltzmann distribution
- Boltzmann equation
- Boltzmann's entropy formula
- Bolzano
- Bomb
- Bombardier Transportation
- Bombardment
- Bombax
- Bombay furniture
- Bombay Presidency
- Bombazine
- Bomber
- Bombing of Guernica
- Bombyx mori
- Bomdong
- Bon (festival)
- Bon
- Bonacolsi
- Bonaire
- Bonamy Dobrée
- Bonamy Price
- Bonanza Creek
- Bonanza
- Bonaventura Berlinghieri
- Bonaventura Genelli
- Bonaventure des Périers
- Bonaventure
- Bond (finance)
- Bond albedo
- Bond market
- Bonded warehouse
- Bonding in solids
- Bondoukou
- Bone bed
- Bone carving
- Bone fracture
- Bone state
- Bone tumor
- Bone
- Bongo drum
- Bonheur du jour
- Bonifatius
- Bonin Islands
- Bonito
- Bonn
- Bonnet Carré Spillway
- Bonnet macaque
- Bonnet's theorem
- Bonnethead
- Bonneville Salt Flats
- Bonnie and Clyde (film)
- Bonnie Blair
- Bono state
- Bonobo
- Bonomi
- Bonsai
- Bontebok National Park
- Bonthe
- Bonus Army
- Bonvesin da la Riva
- Booby trap
- Booby
- Boogiepop Phantom
- Book Cliffs
- Book collecting
- Book lung
- Book of Baruch
- Book of Common Order
- Book of Daniel
- Book of Deuteronomy
- Book of Documents
- Book of Esther
- Book of Exodus
- Book of Ezekiel
- Book of Ezra
- Book of Genesis
- Book of Isaiah
- Book of Jeremiah
- Book of Job
- Book of Joshua
- Book of Judges
- Book of Judith
- Book of Kells
- Book of Lamentations
- Book of Leviticus
- Book of Mormon
- Book of Nehemiah
- Book of Numbers
- Book of Proverbs
- Book of Revelation
- Book of Rites
- Book of Ruth
- Book of Sirach
- Book of Taliesin
- Book of the Civilized Man
- Book of the Consulate of the Sea
- Book of the Dead
- Book of the Wars of the Lord
- Book of Tobit
- Book of Wisdom
- Book
- Bookbinding
- Bookcase
- Bookkeeping
- Bookland (law)
- Books of Chronicles
- Books of Kings
- Books of Samuel
- Books of the Maccabees
- Bookselling
- Boole & Babbage
- Boolean algebra (structure)
- Boolean algebra
- Boolean circuit
- Boolean data type
- Boolean expression
- Boolean satisfiability problem
- Boom (navigational barrier)
- Boomerang
- Boot disk
- Boot ROM
- Boot sector
- Boötes void
- Boötes
- Booting
- Bootloader
- Bopolu
- Boppard
- Bora Bora
- Boracite
- Borage
- Boraginaceae
- Borah Peak
- Boranes
- Borassus flabellifer
- Borate mineral
- Borate
- Borax
- Bordeaux mixture
- Bordeaux
- Border Collie
- Border control
- Border
- Borderline personality disorder
- Bordighera
- Boreads
- Boreal forest of Canada
- Boredom
- Børgefjell National Park
- Borgu
- Borhyaenidae
- Boric acid
- Boris Alekseyevich Golitsyn
- Boris Artzybasheff
- Boris Blacher
- Boris Godunov (opera)
- Boris Godunov
- Boris Kochno
- Boris Kurakin
- Boris Lagutin
- Boris Pilnyak
- Boris Shakhlin
- Boris Shchukin
- Boris Shturmer
- Boris Yampolsky
- Borisoglebsk
- Borjomi
- Borkou
- Borland Database Engine
- Bormio
- Born again
- Born rule
- Born to Run
- Born–Oppenheimer approximation
- Bornean bearded pig
- Bornean bristlehead
- Bornean orangutan
- Borneo lowland rain forests
- Borneo
- Borno State
- Borobudur
- Borohydride
- Borolanite
- Boron group
- Boron nitride
- Boron
- Boronia
- Borosilicate glass
- Boroughbridge
- Borovichi
- Borrelia
- Borromean Islands
- Borsod-Abaúj-Zemplén County
- Bortle scale
- Boruca
- Borujerd
- Borysthenes
- Bosa
- Boscoreale
- Bose gas
- Bose–Einstein condensate
- Bose–Einstein statistics
- Bosnia and Herzegovina
- Bosnian language
- Bosnian War
- Bōsō Peninsula
- Boson
- Bōsōzoku
- Bosphorus Bridge
- Bosporan Kingdom
- Bosporus
- Bosquet
- BOSS Great Wall
- Boss key
- Bossa nova
- Bostanai
- Boston Computer Exchange
- Boston Computer Society
- Boston Harbor Islands National Recreation Area
- Boston Harbor
- Boston Port Act
- Boston Public Library
- Boston Terrier
- Boston University
- Boston
- Bostonite
- Botanical garden
- Botanical Journal of the Linnean Society
- Botany
- Botfly
- Botha
- Bothriolepis
- Botnet
- Botoșani
- Botswana
- Botta
- Bottle
- Bottlenose dolphin
- Bottom quark
- Bottom water
- Bottomry
- Botulism
- Bou Saâda
- Bouafle
- Bouaké
- Bouck White
- Boudica
- Boudin
- Boudinage
- Boufarik
- Bougainville Island
- Bougainvillea
- Bouguer anomaly
- Bouillotte
- Bouïra
- Boulder clay
- Boulder, Colorado
- Boulder
- Bouldnor Formation
- Boulemane
- Boulle
- Bounce message
- Bouncing ball
- Bound state
- Boundary layer
- Boundary Peak (Nevada)
- Boundary scan
- Boundary value problem
- Bounded function
- Bounty (reward)
- Bourbon-l'Archambault
- Bourbon-Lancy
- Bourbonne-les-Bains
- Bourg-en-Bresse
- Bourgeoisie
- Bournemouth
- Bournonite
- Bourse du Travail
- Bouts-Rimés
- Bouvardia
- Bouvet Island
- Bouvines
- Bouzouki
- Boverisuchus
- Bovey Formation
- Bovid hybrid
- Bovidae
- Bovillae
- Bovine respiratory disease
- Bovine viral diarrhea
- Bow (watercraft)
- Bow and arrow
- Bow porcelain factory
- Bowden cable
- Bowdich
- Bowell
- Bowen's reaction series
- Bowerbird
- Bowfin
- Bowie knife
- Bowley's law
- Bowline
- Bowness-on-Windermere
- Bowring Treaty
- Bowring
- Bowstring
- Bowtell
- Box jellyfish
- Box turtle
- Box
- Boxer (dog)
- Boxer Rebellion
- Boxing Day
- Boxwork
- Boy band
- Boy bishop
- Boy Charlton
- Boy Meets World
- Boyar
- Boyd Henry Bode
- Boys' Brigade
- Božena Němcová
- BP
- Bra–ket notation
- Brabant Revolution
- Braccio da Montone
- Brace (tool)
- Brace notation
- Brachiopod
- Brachiosaurus
- Brachistochrone curve
- Brachylogus
- Brachypelma hamorii
- Brachyscome
- Bracken
- Bracket
- Bracklesham Group
- Braconidae
- Bracquemond
- Bradford
- Bradley A. Fiske
- Bradley Walker Tomlin
- Bradymetabolism
- Bradyodonti
- Braga
- Bragg's law
- Brahma
- Brahman
- Brahmana
- Brahmanbaria
- Brahmapur, Odisha
- Brahmaputra River
- Brahmavihara
- Brahmic scripts
- Brahmo Samaj
- Braided river
- Braille
- Brain coral
- Brain damage
- Brain tumor
- Brain
- Brainstem
- Brainwashing
- Braithwaite (surname)
- Brake
- Bramantino
- Brampton
- Branch point
- Branch
- Branches of science
- Branchial arch
- Branching (polymer chemistry)
- Branchiopoda
- Brand Whitlock
- Brand
- Brandeis University
- Brandenburg Concertos
- Brandenburg Gate
- Brandenburg
- Brander Matthews
- Brandis, Germany
- Brane
- Brangus
- Branle
- Branta
- Branxholm, Tasmania
- Brasidas
- Brasília
- Brașov
- Brass instrument
- Brass knuckles
- Brass
- Brassard
- Brassica oleracea
- Brassica rapa
- Brassicaceae
- Brassinosteroid
- Brătianu family
- Bratislava
- Bratsk Hydroelectric Power Station
- Bratsk
- Brattishing
- Braunschweig
- Bravais lattice
- Brave New World
- Brayton cycle
- Brazil nut
- Brazil
- Brazilian Highlands
- Brazilian National Anthem
- Brazilian real
- Brazing
- Brazos River
- Brazzaville
- BRCA1
- Brčko District
- Breach of contract
- Breach of the peace
- Bread
- Breadboard
- Breadfruit
- Breadnut
- Breadth-first search
- Breakdancing
- Breakdown (vehicle)
- Breakdown voltage
- Breakfast at Tiffany's (film)
- Breakfast television
- Breaking Bad
- Breaking wheel
- Breakup of Yugoslavia
- Breast cancer
- Breast disease
- Breast milk
- Breast
- Breastfeeding
- Breathalyzer
- Breathless (1960 film)
- Breccia
- Brecon
- Breech birth
- Breechloader
- Breed club
- Breed
- Breeder reactor
- Breisach
- Bremen (state)
- Bremen
- Bremerhaven
- Bremsstrahlung
- Brenham, Texas
- Brenton
- Brescia
- Bresse
- Bressuire
- Brest, Belarus
- Brest, France
- Bret Harte
- Breton language
- Breton literature
- Bretten
- Bretton Woods Conference
- Bretton Woods system
- Breviary of Alaric
- Brexit
- Brian Bedford
- Brian Boru
- Brian Elias
- Brian Molko
- Brianza
- Briare
- Bribery
- Bric-à-brac
- Brice Marden
- Brick and mortar
- Brick
- Brickfielder
- Brickwork
- Bridal wreath
- Brideshead Revisited
- Bridewell Palace
- Bridge (graph theory)
- Bridge circuit
- Bridge of Sighs
- Bridge of the Americas
- Bridge router
- Bridge tap
- Bridge to Terabithia (novel)
- Bridge whist
- Bridge-Building Brotherhood
- Bridge
- Bridgehead
- Bridgeport, Connecticut
- Bridget Jones's Diary
- Bridgetown
- Bridgewater Canal
- Bridgman effect
- Briey
- Brigadier general
- Brigandage
- Brigandine
- Brigham Young University
- Bright's disease
- Brightest cluster galaxy
- Brightness temperature
- Brighton
- Brigid
- Brijuni
- Brill–Zinsser disease
- Brillouin and Langevin functions
- Brindley
- Brine shrimp
- Briosco
- Brioude
- Brisbane
- Brise soleil
- Bristol Bay
- Bristol
- Brit milah
- Britannia Bridge
- Britannia
- British Academy of Film and Television Arts
- British Academy Television Awards
- British Academy
- British Agricultural Revolution
- British Airways
- British Antarctic Territory
- British Armed Forces
- British Association for Counselling and Psychotherapy
- British Cameroon
- British colonization of the Americas
- British Columbia
- British Empire
- British English
- British fascism
- British Indian Ocean Territory
- British Isles
- British Library
- British literature
- British Museum
- British Overseas Territories
- British Raj
- British rule in Burma
- British thermal unit
- British undergraduate degree classification
- British Virgin Islands
- British West Africa
- British Western Pacific Territories
- Briton Ferry
- Briton Rivière
- Britpop
- Brittany (dog)
- Brittany
- Brittle star
- Brittle–ductile transition zone
- Brittleness
- Brittlestar
- Brix
- Brno
- Broaching (metalworking)
- Broad Breasted White turkey
- Broad-leaved tree
- Broadband Integrated Services Digital Network
- Broadcast journalism
- Broadcast syndication
- Broadcasting (networking)
- Broadcasting
- Broadcom Inc.
- Broadstairs and St Peter's
- Broadvision
- Broadway theatre
- Brocade
- Brocchi's Cluster
- Brocchi
- Broccoli
- Brochantite
- Brochureware
- Brocken
- Brockhaus Enzyklopädie
- Brodiaea
- Brody the Bear
- Brøgger
- Brokeback Mountain
- Bromeliaceae
- Bromide
- Bromine
- Bronchitis
- Bronchodilator
- Bronchus
- Bronson Howard
- Brønsted–Lowry acid–base theory
- Brontosaurus
- Brontoscorpio
- Brontotheriidae
- Bronze Age
- Bronze sculpture
- Bronze
- Bronzing
- Bronzino
- Bronzite
- Brook Taylor
- Brooke Foss Westcott
- Brooklyn Bridge
- Brooklyn Museum
- Brooklyn Nine-Nine
- Brooklyn
- Brooks Range
- Brooks's law
- Brookview Tony Charity
- Brosimum alicastrum
- Brother Leo
- Brow ridge
- Brown algae
- Brown bear
- Brown dwarf
- Brown hyena
- Brown rat
- Brown recluse spider
- Brown University
- Brown v. Board of Education
- Brown
- Brownian motion
- Brownsville, Texas
- Browsing (herbivory)
- Bruay-la-Buissière
- Brucellosis
- Bruckmann
- Bruges
- Brugsch
- Bruise
- Bruiser (bull)
- Brulé
- Brumaire
- Brumath
- Brunei
- Brunetto Latini
- Bruno (bear actor)
- Bruno Bauer
- Bruno of Querfurt
- Brunsbüttel
- Brush
- Brusilov offensive
- Brussels Metro
- Brussels sprout
- Brussels
- Brutalist architecture
- Brute-force attack
- Brute-force search
- Bruttians
- Bruxism
- Bryan Procter
- Bryansk
- Bryaxis
- Bryce Canyon National Park
- Bryophyte
- Bryopsida
- Bryozoa
- Brzozowski
- Bubble chamber
- Bubble chart
- Bubble sort
- Bubbles (chimpanzee)
- Bubiyan Island
- Bubonic plague
- Bucaramanga
- Bucchero
- Buccina
- Buccino
- Bucegi Mountains
- Bucephalus
- Buchans
- Bucharest
- Bucheon
- Buckboard
- Bückeburg
- Bucket sort
- Buckhaven and Methil
- Buckhaven
- Buckingham Canal
- Buckingham Palace
- Buckingham π theorem
- Buckinghamshire
- Buckminsterfullerene
- Bucks point lace
- Buckwheat
- Bucranium
- Bud Fisher
- Bud Freeman
- Bud Wilkinson
- Budapest Metro
- Budapest
- Budaun
- Buddenbrooks
- Buddha-nature
- Buddha's Birthday
- Buddhacharita
- Buddhapālita
- Buddhism in the West
- Buddhism
- Buddhist architecture
- Buddhist art
- Buddhist councils
- Buddhist Hybrid Sanskrit
- Buddhist meditation
- Buddhist monasticism
- Buddhist music
- Buddhist philosophy
- Buddhist texts
- Buddingtonite
- Buddleja
- Bude
- Budge Budge
- Budgerigar
- Budi Utomo
- Budini
- Budj Bim
- Buenaventura Carlos Aribau
- Buenos Aires Province
- Buenos Aires
- Buffalo City Metropolitan Municipality
- Buffalo clover
- Buffalo grass
- Buffalo, New York
- Buffer solution
- Buffet
- Buffy the Vampire Slayer
- Bug (river)
- Bug compatibility
- Bugaku
- Bugbane
- Bugembe
- Bugle
- Bugleweed
- Bugs Bunny
- Bugti
- Bugulma
- Buguruslan
- Buhturi
- Builders' rites
- Building code
- Building design
- Building society
- Building
- Buildout
- Built environment
- Buir Lake
- Buisine
- Bujalance
- Bujumbura
- Bukavu
- Bukhara
- Bukuru
- Bulandshahr
- Bulawayo
- Bulb
- Bulbil
- Bulbul
- Buldhana
- Bulgaria
- Bulgarian Agrarian National Union
- Bulgarian language
- Bulgarian literature
- Bulgarian–Ottoman wars
- Bulgars
- Bulgarus
- Bulimia nervosa
- Bulk modulus
- Bull shark
- Bulla Island
- Bulldog bat
- Bulldog
- Bulldozer
- Bullet Cluster
- Bullet
- Bulletin board system
- Bulletin of the American Mathematical Society
- Bulletin of the Atomic Scientists
- Bulletproof vest
- Bullfighting
- Bullhead shark
- Bullion coin
- Bullnettle
- Bullous pemphigoid
- Bullying
- Bulrush
- Bulstrode Whitelocke
- Bumastus
- Bumblebee
- Bumbulum
- Bunchō
- Bundahishn
- Bundela
- Bundelkhand
- Bundi
- Bundu (state)
- Buneh
- Buner District
- Bungarus
- Bunge Land
- Bungo Channel
- Bunn
- Bunraku
- Bunsei
- Bunting (bird)
- Bunyip
- Bunyoro
- Buôn Ma Thuột
- Buoy
- Buoyancy
- Bupalus and Athenis
- Buphonia
- Buphthalmum salicifolium
- Bupivacaine
- Bur cucumber
- Buraidah
- Burauen
- Burbot
- Burchell's zebra
- Burdur
- Bureaucracy
- Burgage
- Burgas
- Burgenland
- Burger King
- Burghead
- Burglary
- Burgon
- Burgrave
- Burgundian Netherlands
- Burgundians
- Burgundio of Pisa
- Burgundy
- Burhanuddin al-Helmy
- Burial society
- Burial
- Buried Child
- Burj Al Arab
- Burj Khalifa
- Burke and Wills expedition
- Burkhard Christoph von Münnich
- Burkina Faso
- Burlesque
- Burlington, Vermont
- Burma campaign
- Burmann
- Burmese cat
- Burmese language
- Burmese script
- Burn
- Burne-Jones baronets
- Burnell
- Burnetia
- Burning Man
- Burnishing (pottery)
- Burnous
- Burra, South Australia
- Burrau
- Burriana, Castellón
- Bursa
- Burschenschaft
- Burst mode (weapons)
- Burst of Joy
- Buru
- Burundi
- Buryatia
- Buryats
- Bus (computing)
- Bus and Tag
- Bus garage
- Bus rapid transit
- Bus station
- Bus stop
- Bus terminus
- Bus
- Busan Metro
- Busan
- Bush dog
- Bushahr
- Bushehr province
- Bushehr
- Bushel
- Bushido
- Bushiri
- Bushranger
- Bushwacker (bull)
- Business cycle
- Business education
- Business English
- Business intelligence
- Business journalism
- Business logic
- Business networking
- Business park
- Business Process Execution Language
- Business school
- Business Technology Association
- Business
- Businessperson
- Buskin
- Bussa, Nigeria
- Bussa's rebellion
- Bust (sculpture)
- Bustard
- Busy-hour call attempts
- Butades
- Butane
- Butanol
- Buteo
- Butoh
- Butrint
- Butsudan
- Butt (unit)
- Butte
- Butterfly effect
- Butterfly
- Butterflyfish
- Buttonquail
- Buttress root
- Buttress
- Butuan (historical polity)
- Butuan
- Buxar
- Buyid dynasty
- Buys Ballot's law
- Buzău
- Buzdar (tribe)
- By-election
- Byblos
- Bydgoszcz Canal
- Bydgoszcz
- Byerlee's law
- Byerley Turk
- Byrranga Mountains
- Byte
- Bytecode
- Bytom
- Byturidae
- Byway (road)
- Byzantine architecture
- Byzantine art
- Byzantine bureaucracy and aristocracy
- Byzantine Empire
- Byzantine law
- Byzantine literature
- Byzantine music
- Byzantine–Bulgarian wars
- Byzantine–Ottoman wars
- Byzantine–Sasanian War of 602–628
- Byzantine–Seljuk wars
- Byzantium
- C (programming language)
- C Sharp (programming language)
- C. A. Rosetti
- C. H. D. Buys Ballot
- C. H. Douglas
- C. S. Forester
- C. Sankaran Nair
- C. V. Boys
- C++
- Cà Mau
- CA Technologies
- Cabaret (musical)
- Cabaret
- Cabarrus County, North Carolina
- Cabbage
- Cabeiri
- Caber toss
- Cabinda (city)
- Cabinet noir
- Cable car (railway)
- Cable length
- Cable router
- Cable television
- Cable transport
- Cable/DSL gateway
- Cabo da Roca
- Cabo Frio
- Cabo San Lucas
- Cabotage
- Cachar district
- Cache (computing)
- Cache coherence
- Cache replacement policies
- Cachoeira
- Cacography
- Cacomistle
- Cactus
- Cadair Idris
- Cadastre
- Cadaverine
- Cadbury
- Caddisfly
- Cadenabbia
- Cadence
- Cádiz
- Cadmium sulfide
- Cadmium
- Cadmus of Miletus
- Cadmus
- Cadwallader C. Washburn
- Caecilian
- Caecilius of Calacte
- Caecilius Statius
- Cædmon's Hymn
- Caelestius
- Caelius Aurelianus
- Caelum
- Caen
- Caenagnathidae
- Caenorhabditis elegans
- Caere
- Caernarfonshire
- Caesar Baronius
- Caesar cipher
- Caesar Hawkins
- Caesar's civil war
- Caesarea Maritima
- Caesarean section
- Caesium
- Caesius Bassus
- Café Terrace at Night
- Caffeine
- Cagayan de Oro
- Cagayan Valley
- Cage (graph theory)
- Cagli
- Cagliari
- Cagot
- Cáhita
- Cahn–Ingold–Prelog priority rules
- Cahokia
- Cahora Bassa
- Caiazzo
- Caietae Portus
- Caiman
- Cain and Abel
- Cairns
- Cairo Declaration on Human Rights in Islam
- Cairo Governorate
- Cairo Metro
- Cairo University
- Cairo
- Caisson (engineering)
- Caius Gabriel Cibber
- Caius
- Cajatambo Province
- Cajatambo
- Cajeput oil
- Calabar
- Calabarzon
- Calabozo
- Calabresella
- Calabria
- Calabrian (stage)
- Calais
- Calamander
- Calamian Islands
- Calamintha grandiflora
- Calandrinia
- Călărași
- Calarcá
- Calasiao
- Calatayud
- Calatia
- Calaveras Skull
- Calbayog
- Calbe
- Calcarenite
- Calcareous sponge
- Calcareous
- Calceolaria
- Calchaquí
- Calchas
- Calcidius
- Calcination
- Calcisol
- Calcite
- Calcium acetate
- Calcium carbide
- Calcium carbonate
- Calcium channel blocker
- Calcium chloride
- Calcium citrate
- Calcium diglutamate
- Calcium fluoride
- Calcium hydroxide
- Calcium hypochlorite
- Calcium oxide
- Calcium permanganate
- Calcium sulfide
- Calcium
- Calculator
- Calculus (dental)
- Calculus of variations
- Calculus
- Caldera Basin
- Caldera
- Caleb Cushing
- Caleb Mills
- Caleb
- Caledonian Canal
- Caledonian orogeny
- Calendar
- Calendering (textiles)
- Calendula
- Cales
- Calgacus
- Calgary
- Cali
- Caliche
- Caliciales
- California Academy of Sciences
- California Coastal National Monument
- California condor
- California genocide
- California Gold Rush
- California Institute of Technology
- California Native Plant Society
- California State University
- California
- Californium
- Calipers
- Caliphate of Córdoba
- Caliphate
- Calixto García
- Call control
- Call option
- Calla
- Callanish Stones
- Calle de Alcalá
- Callias II
- Calligraphy
- Callimachus
- Callinectes sapidus
- Calling convention
- Callinicus of Heliopolis
- Callinus
- Calliope
- Calliostoma
- Calliphoridae
- Callisthenes
- Callisto (moon)
- Callisto (mythology)
- Callistratus of Aphidnae
- Callorhinchus
- Callosciurus
- Callovian
- Calneh
- Calochortus luteus
- Calomel
- Caloocan
- Calorescence
- Calorie
- Calorimeter (particle physics)
- Calorimeter
- Calorimetry
- Calouste Gulbenkian Museum
- Caltagirone
- Caltanissetta
- Caltha palustris
- Caltrop
- Caluire-et-Cuire
- Calumpit
- Calvert Vaux
- Calves' Head Club
- Calvin and Hobbes
- Calvin cycle
- Calvin Ellis Stowe
- Calvinism
- Calvinistic Methodists
- Calvisia gens
- Calycanthus floridus
- Calyceraceae
- Calycerales
- Calymene
- Calypso (moon)
- Calypso (mythology)
- Calypso music
- Cam follower
- Cam
- Camagüey
- Camaldolese
- Camăr
- Camarasaurus
- Camargo Society
- Camargue
- Cambisol
- Cambium
- Cambodia
- Cambodian Civil War
- Cambodian genocide
- Cambodian–Vietnamese War
- Camborne–Redruth Urban District
- Cambrian explosion
- Cambrian
- Cambric
- Cambridge Platform
- Cambridge, Massachusetts
- Cambridgeshire
- Camel hair
- Camel
- Camellia sinensis
- Camellia
- Camelopardalis
- Camelot
- Cameo glass
- Camera-ready
- Camera
- Camerarius
- Camerino
- Cameron Winslow
- Cameronian
- Cameroon
- Camilla Collett
- Camilla Urso
- Camille Desmoulins
- Camille Jordan (politician)
- Camille Jullian
- Camille Lemonnier
- Camille Pelletan
- Camille Roy
- Camille Saint-Saëns
- Camille-Christophe Gerono
- Camillo Federici
- Camillo Porzio
- Camillo Sitte
- Camillo Sivori
- Camilo Castelo Branco
- Camino de Santiago
- Camisards
- Camouflage
- Camp Fire (organization)
- Campaign furniture
- Campania
- Campanula medium
- Campanulaceae
- Campbell Island, New Zealand
- Campbell's Soup Cans
- Campeche
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- Camphuysen
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- Campinas
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- Campo Grande
- Campodea
- Campos Basin
- Camptosomata
- Camptown Races
- Camú River
- Cần Thơ
- Can-can
- Cana
- Canaan
- Canaanite and Aramaic inscriptions
- Canaanite religion
- Canachus
- Canada goose
- Canada jay
- Canada Science and Technology Museum
- Canada
- Canadaspis
- Canadian Broadcasting Corporation
- Canadian Confederation
- Canadian dollar
- Canadian English
- Canadian literature
- Canadian Museum of History
- Canadian Prairies
- Canadian River
- Canadian Rockies
- Canadian Shield
- Çanakkale
- Canal du Midi
- Canal
- Canaletto
- Canals of Amsterdam
- Canarium luzonicum
- Canarsee
- Canary Islands
- Canastra Mountains
- Canberra
- Cancale
- Cancelbot
- Cancellarii
- Cancer (constellation)
- Cancer pagurus
- Cancer
- Canchungo
- Cancrinite
- Cancún
- Candela
- Candelabra
- Candelaria Caves
- Candelilla wax
- Candida albicans
- Candide
- Candidiasis
- Candle in the Wind
- Candle
- Candlepower
- Candlish
- Candomblé
- Candon
- Cane rat
- Cane River National Heritage Area
- Cane toad
- Canes Venatici
- Caney Fork River
- Cangas del Narcea
- Cango Caves
- Cangrande I della Scala
- Cangue
- Cangzhou
- Caniapiscau, Quebec
- Canid hybrid
- Canidae
- Canine parvovirus
- Caning (furniture)
- Canis Major
- Canis Minor
- Canister shot
- Canker
- Çankırı
- Canna (plant)
- Cannabis (drug)
- Cannabis culture
- Cannabis indica
- Cannabis ruderalis
- Cannabis sativa
- Cannabis
- Cannae
- Canne de combat
- Cannel coal
- Cannes Film Festival
- Cannes
- Cannibalism
- Cannon
- Canoas
- Canoe
- Canon (clergy)
- Canon (music)
- Canon law of the Catholic Church
- Canon law
- Canon regular
- Canonchet
- Canoness
- Canonical account
- Canonical coordinates
- Canonical ensemble
- Canonical transformation
- Canonicus
- Canons of Hippolytus
- Canons Regular of the Holy Sepulchre
- CANopen
- Canopus, Egypt
- Canopus
- Canosa di Puglia
- Cantabri
- Cantabria
- Cantabrian Mountains
- Cantacuzino family
- Cantagalo, Rio de Janeiro
- Cantaloupe
- Cantar de mio Cid
- Cantata
- Cante jondo
- Canterbury Region
- Canterbury
- Cantharidin
- Canticle
- Cantiga
- Cantilever bridge
- Canton (administrative division)
- Canton Island
- Canton of Bern
- Canton of Fribourg
- Canton of Geneva
- Canton of Glarus
- Canton of Jura
- Canton of Lucerne
- Canton of Neuchâtel
- Canton of Schaffhausen
- Canton of Schwyz
- Canton of Solothurn
- Canton of St. Gallen
- Canton of Uri
- Canton of Zug
- Canton of Zürich
- Cantonese opera
- Cantonese people
- Cantonese
- Cantonment
- Cantons of Switzerland
- Cantor set
- Cantor's diagonal argument
- Cantor's theorem
- Cantù
- Canute IV of Denmark
- Canvas
- Canyon
- Canyons of the Ancients National Monument
- Canzona
- Cao Wei
- Caodaism
- Cap de Formentor
- Cap Diamant
- Cap of maintenance
- Cap of the North
- Cap-de-la-Madeleine
- Cap-Haïtien
- Capacitance
- Capacitor
- Capacity factor
- Capacity planning
- Capaneus
- Capannori
- Cape (geography)
- Cape Agulhas
- Cape Barrow
- Cape Bauld
- Cape Bon
- Cape Breton Island
- Cape Cà Mau
- Cape Canaveral
- Cape Chidley
- Cape Cod Canal
- Cape Cod
- Cape Colony
- Cape Crillon
- Cape Deveboynu, Datça
- Cape Eluanbi
- Cape Engaño (Luzon)
- Cape Farewell, Greenland
- Cape Fear (headland)
- Cape Flattery
- Cape Hatteras
- Cape Helles
- Cape Horn
- Cape Howe
- Cape Kamui
- Cape Leeuwin
- Cape Lopatka
- Cape Maisí
- Cape Matapan
- Cape Miseno
- Cape Muroto
- Cape Nordkinn
- Cape of Good Hope
- Cape São Roque
- Cape Sata
- Cape Sōya
- Cape Town
- Cape Verde
- Cape York (Greenland)
- Cape York Peninsula
- Cape Zhelaniya
- Capel Curig
- Capella
- Capena
- Caper
- Capernaum
- Capetian dynasty
- Caphtor
- Capillary action
- Capillary
- Capistrano de Abreu
- Capital (economics)
- Capital (radio network)
- Capital appreciation
- Capital city
- Capital gain
- Capital gains tax
- Capital levy
- Capital punishment
- Capitalism and Freedom
- Capitalism, Socialism and Democracy
- Capitalism
- Capito
- Capitoline Hill
- Capitoline Wolf
- Capitulary of Quierzy
- Capitulary
- Capitulation (surrender)
- Capitulation (treaty)
- Capitulations of the Ottoman Empire
- Capmany
- Capo Colonna
- Capodimonte porcelain
- Caponier
- Cappadocia
- Capparales
- Cappel family
- Capperonnier
- Capra (genus)
- Capraia
- Caprelloidea
- Capricorn and Bunker Group
- Capricornus
- Caps Lock
- Capsaicin
- Capstan (nautical)
- Capstone (cryptography)
- Capsule (pharmacy)
- Captain (naval)
- Captain Ahab
- Captain America
- Captal
- Captorhinida
- Captorhinus
- Capua
- Capuchin monkey
- Capybara
- Caquetio
- Car bomb
- Car wash
- Car
- Caraballo Mountains
- Carabinier
- Caracal
- Caracas Metro
- Caracas
- Caracciolo
- Caradoc Evans
- Caradoc Series
- Caraga
- Caral-Supe civilization
- Caramelization
- Caran d'Ache
- Caranx
- Carapeguá
- Carassius
- Carat (mass)
- Caratasca Lagoon
- Carausius
- Caravaca de la Cruz
- Caravaggio
- Caravel
- Caravelas
- Caraway
- Carballo
- Carbide
- Carbohydrate
- Carbon (API)
- Carbon black
- Carbon budget
- Carbon cycle
- Carbon detonation
- Carbon dioxide
- Carbon disulfide
- Carbon fibers
- Carbon group
- Carbon monoxide
- Carbon nanotube
- Carbon planet
- Carbon sequestration
- Carbon star
- Carbon steel
- Carbon tetrachloride
- Carbon tetrafluoride
- Carbon-14
- Carbon-based life
- Carbon-burning process
- Carbon-dioxide laser
- Carbon-fiber-reinforced polymers
- Carbon
- Carbonate mineral
- Carbonate rock
- Carbonate
- Carbonated water
- Carbonic acid
- Carboniferous
- Carbonium ion
- Carbonyl group
- Carborane acid
- Carborane
- Carboxylic acid
- Carcar
- Carcinogen
- Carcinus maenas
- Card game
- Card manipulation
- Card reader
- Cardamine digitata
- Cardamom
- Cardboard
- Cardcaptor Sakura
- Cárdenas, Cuba
- Cardiac arrest
- Cardiac monitoring
- Cardiac muscle
- Cardiff University
- Cardiff
- Cardigan Welsh Corgi
- Cardinal (bird)
- Cardinal (Catholic Church)
- Cardinal beetle
- Cardinal de Rohan
- Cardinal direction
- Cardinal number
- Cardinal Richelieu
- Cardinal virtues
- Cardinality of the continuum
- Cardinality
- Carding
- Cardiogenic shock
- Cardioid
- Cardiology
- Cardiopulmonary bypass
- Cardiopulmonary resuscitation
- Cardiospermum halicacabum
- Cardiovascular disease
- Cardoon
- Carducci
- Career counseling
- Career
- Carel Vosmaer
- Carex japonica
- Carex
- Carey Act
- Careysburg District
- Cargill
- Cargo aircraft
- Cargo ship
- Cargo
- Cariaco
- Caribbean Community
- Caribbean literature
- Caribbean Plate
- Caribbean Sea
- Caribbean
- Cariboo Mountains
- Caricature
- Caridina
- Carigara
- Carillon
- Carina (constellation)
- Carina Nebula
- Carina–Sagittarius Arm
- Carini
- Carinthia
- Carinus
- Caripe
- Carisbrooke Castle
- Carisbrooke
- Carl Akeley
- Carl Alexander Heideloff
- Carl Andreas Duker
- Carl Benedict Hase
- Carl Blegen
- Carl Christian Hall
- Carl Christian Rafn
- Carl Darling Buck
- Carl Fredrik Pechlin
- Carl Friedrich Abel
- Carl Friedrich Gauss
- Carl Friedrich Heinrich Credner
- Carl Friedrich Nägelsbach
- Carl Friedrich Philipp von Martius
- Carl Friedrich Wenzel
- Carl Friedrich Wilhelm Alfred Fleckeisen
- Carl Gustaf af Leopold
- Carl Gustaf Nordin
- Carl Gustaf Tessin
- Carl Gustaf Wrangel
- Carl Gustav Carus
- Carl Gustav Jacob Jacobi
- Carl H. Eigenmann
- Carl Haag
- Carl Hagenbeck
- Carl Jonas Love Almqvist
- Carl Linnaeus
- Carl Loewe
- Carl Ludwig Christian Rümker
- Carl Ludwig
- Carl Maria von Weber
- Carl Michael Bellman
- Carl Nägeli
- Carl Paul Caspari
- Carl Peters
- Carl Philipp Emanuel Bach
- Carl Piper
- Carl R. Byoir
- Carl Reinecke
- Carl Remigius Fresenius
- Carl Richard Moore
- Carl Rosa
- Carl Ruggles
- Carl Russell Fish
- Carl Schurz
- Carl Severing
- Carl Snoilsky
- Carl Sternheim
- Carl Stotz
- Carl Theodor Dreyer
- Carl Van Doren
- Carl Vogt
- Carl von Marr
- Carl von Rokitansky
- Carl von Voit
- Carl Wagner
- Carl XVI Gustaf
- Carle Vernet
- Carleton Place
- Carleton S. Coon
- Carleton Washburne
- Carleton Watkins
- Carlisle Peace Commission
- Carlism
- Carlo Alessandro Guidi
- Carlo Alfredo Piatti
- Carlo Caproli
- Carlo Cassola
- Carlo Cattaneo
- Carlo Cignani
- Carlo Crivelli
- Carlo Denina
- Carlo Dolci
- Carlo Fea
- Carlo Felice Nicolis, conte di Robilant
- Carlo Filangieri
- Carlo Giuseppe Guglielmo Botta
- Carlo Gozzi
- Carlo Innocenzo Frugoni
- Carlo Maratta
- Carlo Maria Curci
- Carlo Marochetti
- Carlo Ottavio, Count Castiglione
- Carlo Passaglia
- Carlo Pisacane
- Carlo Poerio
- Carlo Zeno
- Carloman II
- Carlos Andrés Pérez
- Carlos Antonio López
- Carlos Arniches
- Carlos Arruza
- Carlos Bousoño
- Carlos de Sigüenza y Góngora
- Carlos Finlay
- Carlos Francisco de Croix, 1st Marquess of Croix
- Carlos Germán Belli
- Carlos Luis de Borbón
- Carlos Manuel Arana Osorio
- Carlos Manuel de Céspedes
- Carlos Mendieta
- Carlos Mérida
- Carlos Raúl Villanueva
- Carlos Reyles
- Carlos Saura
- Carlos, Prince of Asturias
- Carlsbad Caverns National Park
- Carlsberg Ridge
- Carlton J. H. Hayes
- Carmagnola
- Carmagnole
- Carmaux
- Carmelites
- Carmen McRae
- Carmen Polo
- Carmen
- Carmina Burana (Orff)
- Carmina Burana
- Carmine
- Carmona, Spain
- Carnac stones
- Carnarvon Gorge
- Carnarvon Range
- Carnatic music
- Carnatic region
- Carnatic Wars
- Carnegie Corporation of New York
- Carnegie library
- Carnegie Mellon University
- Carneia
- Carnelian
- Carnian
- Carnival
- Carnivora
- Carnivore
- Carnivorous plant
- Carnosauria
- Carnot cycle
- Carnot heat engine
- Carnotaurus
- Carnuntum
- Carol Burnett
- Carol of the Bells
- Carol Weiss King
- Carolina Michaëlis de Vasconcelos
- Carolina Nairne
- Carolina Reaper
- Caroline Bartlett Crane
- Caroline Clive
- Caroline Herschel
- Caroline Howard Gilman
- Caroline Islands
- Caroline Norton
- Caroline of Brunswick
- Caroline Pichler
- Caroline Schelling
- Caroline Severance
- Caroline Yale
- Carolingian art
- Carolingian dynasty
- Carolingian Empire
- Carolus Sigonius
- Carolus-Duran
- Carolyn Kizer
- Carolyn Sherif
- Carolyn Wells
- Carora
- Carotenoid
- Carp
- Carpal bones
- Carpal tunnel syndrome
- Carpathian Mountains
- Carpenter ant
- Carpenter bee
- Carpenter Gothic
- Carpenteria
- Carpentry
- Carpet moth
- Carpet shark
- Carpet
- Carpool
- Carpzov family
- Carrara
- Carraresi
- Carrefour
- Carrel
- Carriage
- Carrie Nation
- Carrier generation and recombination
- Carrière
- Carrizo Plain
- Carroccio
- Carrodus
- Carroll D. Wright
- Carronade
- Carrot
- Carrying capacity
- Carsoli
- Carson City, Nevada
- Carsten Borchgrevink
- Carsten Hauch
- Carsten Niebuhr
- Carsulae
- Cart
- Cartagena, Colombia
- Cartagena, Spain
- Carter G. Woodson
- Carter Stanley
- Carterfone
- Cartesian closed category
- Cartesian coordinate system
- Cartesian product
- Cartesianism
- Carthage
- Cartilage
- Cartogram
- Cartography
- Cartoon Network
- Cartoon
- Cartoonist
- Cartridge (firearms)
- Cartwheel Galaxy
- Carucate
- Carúpano
- Carus
- Carvacrol
- Carving
- Carvone
- Cary T. Grayson
- Carya glabra
- Carya laciniosa
- Carya ovata
- Carya tomentosa
- Caryatid
- Caryophyllales
- Caryophyllene
- Casablanca (film)
- Casablanca
- Casale Monferrato
- Casamari Abbey
- Casas Grandes
- Casaubon
- Cascade Range
- Cascade Volcanoes
- Cascades de Karfiguéla
- Cascina
- Cascode
- Case study
- Case Western Reserve University
- Case-hardening
- Casemate
- Casement window
- Casey at the Bat
- Cash crop
- Cash flow statement
- Cashew
- Cashier
- Cashmere goat
- Cashmere wool
- Casilinum
- Casimir Delavigne
- Casimir effect
- Casimir III the Great
- Casimir Pierre Périer
- Casimir Pulaski
- Casimir, Comte de Montrond
- Casinum
- Casiquiare canal
- Casket letters
- Caslon
- Casluhim
- Caspar Aquila
- Caspar Bartholin the Elder
- Caspar Netscher
- Caspar
- Caspian Depression
- Caspian Sea
- Caspian tiger
- Cass Canfield
- Cass Gilbert
- Cassano all'Ionio
- Cassava
- Cassegrain reflector
- Cassella
- Cassette tape
- Cassia fistula
- Cassiano Ricardo
- Cassianus Bassus
- Cassidae
- Cassini–Huygens
- Cassini's Division
- Cassini's laws
- Cassino (card game)
- Cassiodorus
- Cassiopeia (constellation)
- Cassiopeia (mother of Andromeda)
- Cassiopeia A
- Cassiterides
- Cassius Dio
- Cassius Dionysius
- Cassius Longinus (philosopher)
- Cassowary
- Cast iron
- Cast-iron architecture
- Castalia
- Castanospermum
- Castaway
- Caste system among South Asian Christians
- Caste system in India
- Caste War of Yucatán
- Caste
- Castelfranco Emilia
- Castelfranco Veneto
- Castellammare di Stabia
- Castelnaudary
- Castelsarrasin
- Castelvetrano
- Castigliano's method
- Castile and León
- Castilla–La Mancha
- Castillon-la-Bataille
- Casting (metalworking)
- Castle Shannon, Pennsylvania
- Castle-guard
- Castle
- Castor (star)
- Castor and Pollux
- Castorocauda
- Castoroides
- Castration
- Castrato
- Castries
- Castro Urdiales
- Castro, Apulia
- Castrop-Rauxel
- Castruccio Castracani
- Castruccio
- Casualty (person)
- Casuarinaceae
- Cat flea
- Cat on a Hot Tin Roof
- Cat's Eye Nebula
- Cat
- Catabolism
- Cataclasite
- Cataclysmic variable star
- Catalan art
- Catalan Countries
- Catalan language
- Catalan number
- Çatalhöyük
- Catalogues of Fundamental Stars
- Catalonia
- Catalysis
- Catalyst poisoning
- Catalytic converter
- Catamaran
- Catamarca Province
- Catanduanes
- Catania
- Catapult
- Cataract
- Catauxi
- Catawba people
- Catch the Ten
- Catch-22
- Catechesis
- Catechin
- Catechism
- Catechol
- Catecholamine
- Catechu
- Category (mathematics)
- Category theory
- Catenary
- Cateran
- Caterham
- Caterina Sforza
- Caterpillar Inc.
- Caterpillar
- Catfish
- Catgut
- Catharism
- Cathay Pacific
- Cathedral of Christ the Saviour
- Cathedral-Basilica of Our Lady of the Pillar
- Cathedral
- Catherine Cornaro
- Catherine de' Medici
- Catherine Henriette de Balzac d'Entragues
- Catherine I of Russia
- Catherine of Genoa
- Catherine Palace
- Catherine Sedley, Countess of Dorchester
- Catherine the Great
- Catherine Théot
- Cathetus
- Cathode-ray tube
- Cathode
- Catholic Church in Germany
- Catholic Church
- Catholic school
- Catholicity
- Cato the Elder
- Cats (musical)
- Catshark
- Cattle egret
- Cattle
- Catulle Mendès
- Catwoman
- Caucasian Albania
- Caucasian War
- Caucasus campaign
- Caucasus Mountains
- Caucasus
- Cauchy principal value
- Cauchy stress tensor
- Cauchy–Riemann equations
- Cauchy–Schwarz inequality
- Cauchy's integral formula
- Caudebec-en-Caux
- Caudle
- Caudofoveata
- Cauliflower
- Caulonia (ancient city)
- Causality (physics)
- Causality
- Causes of the French Revolution
- Causes of World War II
- Cauterets
- Cauterization
- Cautín Province
- Cava de' Tirreni
- Cavaedium
- Cavaillon
- Cavalier King Charles Spaniel
- Cavalleria rusticana
- Cavalry
- Cavatina
- Cave automatic virtual environment
- Cave bear
- Cave hyena
- Cave of Altamira
- Cave of El Castillo
- Cave of Swallows
- Cave painting
- Cave
- Cavendish banana
- Cavendish experiment
- Caves of Aggtelek Karst and Slovak Karst
- Caves of Han-sur-Lesse
- Cavetto
- Caviar
- Cavite
- Cavity magnetron
- Cawdor
- Cayenne pepper
- Cayenne
- Cayley graph
- Cayman Islands
- Cazin
- CBS
- CCMP (cryptography)
- CD ripper
- CDATA
- Ceará
- Ceawlin of Wessex
- Cebu City
- Cebu
- Cebuano language
- CEBus
- Cecco Angiolieri
- Cecco d'Ascoli
- Cecidomyiidae
- Cecil Reddie
- Cecile de Wentworth
- Cecilia Beaux
- Cecrops
- Cedrus
- Cefalexin
- Cefalù
- Cefazolin
- Cegléd
- Ceglie Messapica
- Cehegín
- Ceiling
- Celadet Alî Bedirxan
- Celaenae
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- Charles Sumner
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- Charles University
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- Chinese zodiac
- Chinhoyi Caves
- Chino cloth
- Chintz
- Chionoecetes
- Chios
- Chip (CDMA)
- Chip carrier
- Chip on board
- Chipata
- Chipmunk
- Chiquititas
- Chirality (chemistry)
- Chirality (physics)
- Chironex fleckeri
- Chiropractic
- Chirostomias
- Chirped pulse amplification
- Chisel
- Chishti Order
- Chișinău
- Chistoy Banki
- Chita, Zabaykalsky Krai
- Chital
- Chitin
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- Chitradurga district
- Chitrakoot Dham (Karwi)
- Chitral
- Chittagong Division
- Chittagong
- Chittur-Thathamangalam
- Chiusi
- Chivalric romance
- Chivalry
- Chivasso
- Chives
- Chiyou
- Chlamydia
- Chlamydomonas
- Chlamydosaurus
- Chlodwig, Prince of Hohenlohe-Schillingsfürst
- Chloe
- Chlorate
- Chlorella
- Chloride
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- Chlorite group
- Chlorite
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- Chlorocebus
- Chlorofluorocarbon
- Chloroform
- Chloromethane
- Chlorophenol
- Chlorophyll
- Chlorophyta
- Chloroplast DNA
- Chloroplast
- Chlorotrifluoroethylene
- Chlorpromazine
- Chlothar I
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- CHMOS
- Cho Oyu
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- Chocolate Hills
- Choctaw Nation of Oklahoma
- Choctaw
- Choe Je-u
- Choerilus (playwright)
- Choerilus of Iasus
- Choerilus of Samos
- Chogha Zanbil
- Choir (architecture)
- Choir
- Choisya ternata
- Chojnów
- Choke (electronics)
- Chokhmah
- Choking
- Chola art and architecture
- Chola dynasty
- Cholecystography
- Cholera
- Cholesterol
- Cholet
- Cholones
- Chomsky hierarchy
- Chomutov
- Chondrichthyes
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- Chongchon River
- Chongjin
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- Chongqing Rail Transit
- Chongqing
- Chōnin
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- Chonotrich
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- Choragic Monument of Lysicrates
- Chorazin
- Chord (music)
- Chord progression
- Chordate
- Choregos
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- Choricius of Gaza
- Chorin
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- Chorizema
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- Chorography
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- Chorzów
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- Christendom
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- Christian angelology
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- Christian Jensen Lofthuus
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- Christian pacifism
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- Christian Rakovsky
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- Christian the Younger of Brunswick
- Christian Thomasius
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- Christianity
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- Christians
- Christiern Pedersen
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- Christine de Pizan
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- Christmas carol
- Christmas elf
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- Christmas Eve
- Christmas Island red crab
- Christmas Island
- Christmas music
- Christmas rose
- Christmas traditions
- Christmas tree
- Christmas
- Christmasberry
- Christmastide
- Christo and Jeanne-Claude
- Christodorus
- Christoffer Wilhelm Eckersberg
- Christoph Bernhard von Galen
- Christoph Ernst Luthardt
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- Christoph Friedrich Nicolai
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- Christoph Sauer
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- Christophe Antoine Gerle
- Christophe de Beaumont
- Christopher Anstey
- Christopher Beeston
- Christopher Clavius
- Christopher Codrington
- Christopher Columbus Langdell
- Christopher Columbus
- Christopher Glaser
- Christopher Hansteen
- Christopher Hatton
- Christopher Jacob Boström
- Christopher Myngs
- Christopher Newman Hall
- Christopher Simpson
- Christopher Wandesford
- Christopher Wordsworth (divine)
- Christopher Wordsworth
- Christopher Wren
- Christopher, Count of Oldenburg
- Chroma subsampling
- Chromadorida
- Chromalveolata
- Chromate and dichromate
- Chromatic aberration
- Chromatic polynomial
- Chromatic scale
- Chromaticity
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- Chrome yellow
- Chromebook
- Chromium(II) acetate
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- Chromoprotein
- Chromosomal crossover
- Chromosomal translocation
- Chromosome abnormality
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- Chromosphere
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- Chronology
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- Chrysanthemum
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- Chrysaora fuscescens
- Chrysaora
- Chryselephantine sculpture
- Chrysippus
- Chrysler Building
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- Chrysoberyl
- Chrysochus auratus
- Chrysogonum virginianum
- Chrysopelea
- Chrysoprase
- Chrysopsis
- Chthonian planet
- Chthonic
- Chu (state)
- Chu Ci
- Chu Văn Tấn
- Chu–Han Contention
- Chūbu region
- Chubut Province
- Chud
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- Chuhuiv
- Chukchi Peninsula
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- Chumash people
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- Chupacabra
- Chur
- Church (building)
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- Church Army
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- Church music
- Church of Cyprus
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- Church of the Holy Sepulchre
- Church rate
- Church service
- Church–Turing thesis
- Churches Together in Britain and Ireland
- Churchill Babington
- Churchill River (Hudson Bay)
- Churching of women
- Chutia Kingdom
- Chuuk Lagoon
- Chuuk State
- Chuvash language
- Chuvashia
- Chytridiomycota
- Cicada
- Cicero
- Cicerone
- Cichlid
- CIE 1931 color space
- CIELAB color space
- CIELUV
- Cienfuegos
- Cigar
- Cigarette
- Cigoli
- Cilegon
- Ciliate
- Cilicia
- Cilium
- Cimahi
- Cimarosa
- Cimarron River (Arkansas River tributary)
- Cimetidine
- Cimicifuga
- Cimmerians
- Cimon of Cleonae
- Cincinnati
- Cinder cone
- Cinderella (Prokofiev)
- Cinderella
- Cindy Crawford
- Cinema of Africa
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- Cinema of Australia
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- Cinema of China
- Cinema of Egypt
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- Cinema of Nigeria
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- Cinema of Spain
- Cinema of Taiwan
- Cinema of the Soviet Union
- Cinema of the United Kingdom
- Cinema of the United States
- Cinema of Turkey
- Cinematograph
- Cinematography
- Cineraria
- Cinereous vulture
- Cingoli
- Cinnabar
- Cinnamaldehyde
- Cinnamomum camphora
- Cinnamon
- Cinnoline
- Cinquecento
- Cintra
- Cipher
- Cippus
- Cipriani Potter
- Circadian rhythm
- Circassian genocide
- Circassians
- Circinus
- Circle dance
- Circle of fifths
- Circle of latitude
- Circle
- Circuit breaker
- Circuit design
- Circular motion
- Circular note
- Circular polarization
- Circulation (physics)
- Circulation problem
- Circulatory system
- Circumcision
- Circumference
- Circumferentor
- Circumstellar disc
- Circumstellar habitable zone
- Circus Maximus
- Circus
- Cirebon
- Cirencester
- Cirillo
- Ciro Ferri
- Ciro Pinsuti
- Cirque
- Cirrhitidae
- Cirrhosis
- Cirrocumulus cloud
- Cirrostratus cloud
- Cirrostratus nebulosus
- Cirrus cloud
- Cirsium arvense
- Cirsium
- Cirta
- Cis-Sutlej states
- Cis–trans isomerism
- Cisco
- Cisplatine War
- Cistercians
- Cistern
- Citation (horse)
- Citation
- CITES
- Citgo
- Cithara
- Citibank
- Citizen journalism
- Citizen Kane
- Citizens United v. FEC
- Citizens' assemblies of the Roman Republic
- Citizenship
- Citole
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- City block
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- City God (China)
- City Lights
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- City of God (2002 film)
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- City of Tshwane Metropolitan Municipality
- City of Westminster
- City Point, Virginia
- City-state
- City
- Ciudad del Este
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- Ciudad Guayana
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- Civics
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- Civil and political rights
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- Civil code
- Civil death
- Civil defense
- Civil Disobedience (Thoreau)
- Civil disobedience
- Civil disorder
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- Civil law (legal system)
- Civil law notary
- Civil liberties
- Civil naming ceremony
- Civil Procedure Rules
- Civil procedure
- Civil rights movement (1865–1896)
- Civil rights movement (1896–1954)
- Civil rights movement
- Civil rights movements
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- Civil war
- Civilization
- Civita Castellana
- Civitavecchia
- Claim rights and liberty rights
- Clam
- Clamator
- Clamecy, Nièvre
- Clamp (tool)
- Clan Keith
- Clan Maxwell
- Clan Ruthven
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- Clanvowe
- Clapboard
- Clapperton
- Claque
- Clara Louise Kellogg
- Clara Marshall
- Clara Novello
- Clara Reeve
- Claremont Colleges
- Clarendonian
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- Clarinet Concerto (Mozart)
- Clarinet
- Clarion Fracture Zone
- Clarissa
- Clarkson Frederick Stanfield
- Class (biology)
- Class (set theory)
- Class consciousness
- Class discrimination
- Class field theory
- Class-4 telephone switch
- Class-5 telephone switch
- Classic book
- Classic Mac OS
- Classic of Mountains and Seas
- Classic of Poetry
- Classical antiquity
- Classical Arabic
- Classical architecture
- Classical Athens
- Classical Cepheid variable
- Classical Chinese
- Classical conditioning
- Classical electromagnetism
- Classical electron radius
- Classical element
- Classical field theory
- Classical Gardens of Suzhou
- Classical Greece
- Classical Hollywood cinema
- Classical Latin
- Classical liberalism
- Classical limit
- Classical mechanics
- Classical music
- Classical period (music)
- Classical physics
- Classical swine fever
- Classicism
- Classics
- Classification of finite simple groups
- Classification of Indigenous peoples of the Americas
- Clastic rock
- Clastidium
- Clathrate compound
- Claud Hamilton, 1st Lord Paisley
- Claude Adrien Helvétius
- Claude Alexandre de Bonneval
- Claude Antoine, comte Prieur-Duvernois
- Claude Basire
- Claude Bernard
- Claude Bouthillier
- Claude Capperonnier
- Claude Charles Fauriel
- Claude de Bourdeille, comte de Montrésor
- Claude de Rouvroy, duc de Saint-Simon
- Claude Drigon, Marquis de Magny
- Claude Fauchet (historian)
- Claude Fauchet (revolutionist)
- Claude Favre de Vaugelas
- Claude Fleury
- Claude Fournier (revolutionary)
- Claude Frédéric-Armand Schaeffer
- Claude Gillot
- Claude Joseph Rouget de Lisle
- Claude Lorrain
- Claude Louis Hector de Villars
- Claude Louis Séraphin Barizain
- Claude Louis, Comte de Saint-Germain
- Claude Martin
- Claude Matthieu, Count Gardane
- Claude Mauriac
- Claude Michel
- Claude Pajon
- Claude Victor-Perrin, duc de Bellune
- Claude Vigée
- Claude-Carloman de Rulhière
- Claude-Étienne Minié
- Claude-Henri de Fusée de Voisenon
- Claude-Joseph Vernet
- Claude-Louis Mathieu
- Claude-Pierre Goujet
- Claude, Duke of Guise
- Claudian
- Claudine Françoise Mignot
- Claudine Guérin de Tencin
- Claudio Acquaviva
- Claudio Monteverdi
- Claudius Buchanan
- Claudius Mamertinus
- Claudius Rich
- Claudius
- Claus Harms
- Clause
- Clausen
- Clausius theorem
- Clausius–Clapeyron relation
- Clausius–Mossotti relation
- Clausthal-Zellerfeld
- Clavichord
- Clavicle
- Clavicytherium
- Clavier-Übung III
- Claw
- Clay mineral
- Clay-with-Flints
- Clay
- Claymore
- Claytonia sibirica
- CLEAN (algorithm)
- Cleaner shrimp
- Cleaner
- Cleanroom
- Clear-air turbulence
- Clearing the neighbourhood
- Cleator Moor
- Cleavage (embryo)
- Cleavage (geology)
- Clebsch–Gordan coefficients
- Clef
- Cleft lip and cleft palate
- Cleidocranial dysostosis
- Cleitarchus
- Cleitor
- Clemence Dane
- Clemens August Droste zu Vischering
- Clemens Brentano
- Clement Biddle
- Clément Charles François de Laverdy
- Clement Charles Julian Webb
- Clement Claiborne Clay
- Clement le Neve Foster
- Clément Marot
- Clement of Rome
- Clement Vallandigham
- Clement Wood
- Clemente Solaro, Count La Margherita
- Clementine
- Clements Kadalie
- Clements Markham
- Clemmys
- Cleobulus
- Cleome
- Cleomenes I
- Cleon
- Cleopas
- Cleopatra's Needle
- Cleopatra
- Cleres Zoological Park
- Clerestory
- Clergy
- Cleridae
- Clérissy faience factories
- Clerk
- Clermont-Ferrand
- Clermont-l'Hérault
- Clermont, Oise
- Clervaux
- Clethra alnifolia
- Cleveland
- Clianthus
- Click beetle
- Click consonant
- Click path
- Click-through rate
- Clidastes
- Client (computing)
- Client–server model
- Cliff dwelling
- Cliff effect
- Cliff
- Cliffed coast
- Clifford Whittingham Beers
- Cliftonia
- Climate change adaptation
- Climate change and fisheries
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- Climate change
- Climate model
- Climate of Antarctica
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- Climate of Uranus
- Climate sensitivity
- Climate system
- Climate variability and change
- Climate
- Climatic adaptation
- Climatius
- Climatology
- Climax (rhetoric)
- Clingmans Dome
- Clinical pathology
- Clinical psychology
- Clinoclase
- Clinoptilolite
- Clint Eastwood
- Clinton B. Fisk
- Clintonite
- Clione limacina
- Clionidae
- Clipper chip
- Clipper
- Clipperton Fracture Zone
- Clipperton Island
- Clique (graph theory)
- Clique problem
- Clisson
- Clitoria
- Clitoris
- Clitumnus
- Clitunno
- Clive Bell
- Clivia
- Clobbering
- Clock domain crossing
- Clock face
- Clock generator
- Clock signal
- Clock
- Clodius Aesopus
- Clodius Albinus
- Cloning vector
- Cloning
- Clonmacnoise
- Close coupled field technology
- Close Encounters of the Third Kind
- Close-Up (1990 film)
- Closed shop
- Closed system
- Closed-end fund
- Closing argument
- Clostridium
- Closure temperature
- Clothes dryer
- Clothes moth
- Clothing industry
- Clothing
- Clotilde de Surville
- Clotilde
- Cloud Atlas (novel)
- Cloud chamber
- Cloud computing
- Cloud condensation nuclei
- Cloud Gate
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- Cloud
- Cloudburst
- Clouded leopard
- Cloudesley Shovell
- Cloudflare
- Clove
- Clovelly
- Clover
- Clovis culture
- Clovis Hugues
- Clown
- Club (organization)
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- Cluj-Napoca
- Cluniac Reforms
- Cluny Abbey
- Clupeidae
- Clupeiformes
- Clusium
- Cluster munition
- Clustered file system
- Clutch
- Cluttering
- Clydesdale horse
- CMB cold spot
- CMOS
- CMYK color model
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- Cnidaria
- CNN
- CNO cycle
- Co-option
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- Co-respondent
- Coach (bus)
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- Coagulation
- Coahuila
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- Coalsack Nebula
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- Coat of arms
- Coati
- Coaxial cable
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- Cobalt
- Cobaltite
- Cobble (geology)
- Cobbold
- Cobija
- COBOL
- Cobra
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- Coca
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- Coccidia
- Coccinella septempunctata
- Coccinellidae
- Cochabamba
- Cochem
- Cochlea
- Cochrane Library
- Cock Lane ghost
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- Cockatoo
- Cockayne Hatley
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- Cockfight
- Cockle (bivalve)
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- Cockroach
- Coco Chanel
- Cocoa (API)
- Coconucan language
- Coconut crab
- Coconut
- Cocos (Keeling) Islands
- Cocos Island
- Cocos Plate
- Cod
- Coda (music)
- Code bloat
- Code Geass
- Code of Hammurabi
- Code of law
- Code page 437
- Code talker
- Code-division multiple access
- Code-switching
- Codeine
- Codex Gigas
- Codex Regius
- Codiaeum
- Codification (law)
- Coding theory
- Coelacanth
- Coelius Sedulius
- Coelophysis
- Coelurosauria
- Coenaculum
- Coesfeld
- Coeur d'Alene, Idaho
- Coevolution
- Coffee Prince (2007 TV series)
- Coffee
- Coffer
- Cofferdam
- Coffin
- Cogeneration
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- Coin grading
- Coin magic
- Coin
- Coinage Offences Act
- Coke (fuel)
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- Colchicum bulbocodium
- Colchicum trigynum
- Colchicum
- Colchis
- Cold Food Festival
- Cold fusion
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- Cold wave
- Coldwater fish
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- Colgate-Palmolive
- Colima
- Colin Blackburn, Baron Blackburn
- Colin Campbell, 1st Baron Clyde
- Colin MacInnes
- Colin Muset
- Coliphage
- Collaborative law
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- Collage
- Collagen disease
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- Collard (plant)
- Collatia
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- Collection (museum)
- Collective bargaining
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- Collective Security Treaty Organization
- Collectivity of Saint Martin
- Collège de France
- College of Cardinals
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- Colleoni
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- Collider
- Collie
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- Collimated beam
- Collimator
- Collin d'Harleville
- Collision frequency
- Collision theory
- Collision
- Colloid
- Colloidal crystal
- Collomia
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- Collotype
- Colman
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- Colobinae
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- Colon classification
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- Colonel
- Colonial architecture
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- Colonial Revival architecture
- Colonial war
- Colonial Williamsburg
- Colonialism
- Colonna family
- Colonnade
- Colony of Natal
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- Colony of Rhode Island and Providence Plantations
- Colony of Virginia
- Color blindness
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- Color charge
- Color correction
- Color cycling
- Color depth
- Color difference
- Color field
- Color Force
- Color gel
- Color index
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- Color mapping
- Color motion picture film
- Color printing
- Color space
- Color television
- Color theory
- Color vision
- Color
- Colorado Plateau
- Colorado potato beetle
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- Colorado River Storage Project
- Colorado River
- Colorado Springs, Colorado
- Colorado
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- Colotomy
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- Colubridae
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- Columbia River Gorge
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- Columbia sheep
- Columbia University
- Columbia, Missouri
- Columbia, South Carolina
- Columbiad
- Columbian exchange
- Columbian mammoth
- Columbidae
- Columbina
- Columbine High School massacre
- Columbo
- Columbus O'Donnell Iselin
- Columbus, Ohio
- Columella
- Column chromatography
- Column
- Colure
- Colutea arborescens
- Coluthus
- Colvin Smith
- Coly
- Coma Berenices
- Coma Cluster
- Coma
- Comacchio
- Comana (Cappadocia)
- Comana Pontica
- Comanche
- Comandra
- Comb
- Combat helmet
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- Combinatory logic
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- Comcast
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- Comity
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- Comma
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- Commandeering
- Commander Islands
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- Commelina
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- Commemorative coin
- Commensalism
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- Commerce
- Commercial area
- Commercial bank
- Commercial Court
- Commercial treaty
- Commercium
- Commercy
- Commesso
- Commissariat
- Commissary
- Commissionaire
- Commodian
- Commodity market
- Commodore (rank)
- Commodore 64
- Common bream
- Common brushtail possum
- Common cold
- Common collared lizard
- Common cuckoo
- Common dace
- Common death adder
- Common envelope
- Common Gateway Interface
- Common hill myna
- Common house gecko
- Common knowledge (logic)
- Common law
- Common lodging-house
- Common logarithm
- Common midwife toad
- Common myna
- Common nighthawk
- Common nightingale
- Common octopus
- Common ostrich
- Common pheasant
- Common practice period
- Common purpose
- Common quail
- Common raccoon dog
- Common raven
- Common ringtail possum
- Common seadragon
- Common Sense
- Common sense
- Common snapping turtle
- Common starling
- Common swift
- Common toad
- Common walkingstick
- Common wheat
- Common wood pigeon
- Commonwealth of Independent States
- Commonwealth of Nations
- Communication channel
- Communication protocol
- Communication studies
- Communication
- Communications satellite
- Communism
- Communist International
- Communist Party of the Soviet Union
- Communist revolution
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- Community college
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- Community paper
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- Community
- Commutative algebra
- Commutative diagram
- Commutative property
- Commutative ring
- Commuter rail
- Commuter town
- Comodoro Rivadavia
- Comoé National Park
- Comoro Islands
- Comoros
- Comoving and proper distances
- Compact disc
- Compact space
- Compact star
- CompactFlash
- Compactness theorem
- Compacton
- Compagnie Commerciale de Colonisation du Congo Français
- Companding
- Companion planting
- Companions of the Prophet
- Company (musical)
- Company style
- Company union
- Company
- Comparability
- Comparative history
- Comparative law
- Comparative linguistics
- Comparative mythology
- Comparative religion
- Comparative
- Comparison (grammar)
- Comparison of disk cloning software
- Comparison of the imperial and US customary measurement systems
- Comparison
- Compass (drawing tool)
- Compass
- Compassion
- Competition (biology)
- Competition (economics)
- Competition law
- Competition
- Compiler
- Complaint
- Complement (set theory)
- Complement fixation test
- Complementarity (physics)
- Complementary DNA
- Complete blood count
- Complete graph
- Complex analysis
- Complex data type
- Complex gain
- Complex logarithm
- Complex number
- Complex plane
- Complex system
- Complex volcano
- Complexo do Alemão
- Complexometric indicator
- Complutense University of Madrid
- Component (graph theory)
- Component-based software engineering
- Composita
- Composite image filter
- Composite laminate
- Composite material
- Composite number
- Composite order
- Composition (visual arts)
- Composition with Red Blue and Yellow
- Compost
- Compound bow
- Compound pier
- Comprador
- Comprehensive Employment and Training Act
- Comprehensive metabolic panel
- Compress
- Compressed air
- Compressible flow
- Compression (physics)
- Compressive strength
- Compressor
- Compromise of 1877
- Compromise of Nobles
- Compsa
- Compsognathus
- Comptes rendus de l'Académie des Sciences
- Compton generator
- Compton scattering
- Compton wavelength
- Comptonia peregrina
- Compulsory education
- Compurgation
- CompuServe
- Computability theory
- Computable function
- Computable number
- Computable set
- Computably enumerable set
- Computably inseparable
- Computation
- Computational astrophysics
- Computational biology
- Computational chemistry
- Computational complexity theory
- Computational fluid dynamics
- Computational geophysics
- Computational linguistics
- Computational physics
- Computational science
- Computer & Communications Industry Association
- Computer and network surveillance
- Computer animation
- Computer appliance
- Computer architecture
- Computer case
- Computer chess
- Computer cluster
- Computer cooling
- Computer data storage
- Computer display standard
- Computer emergency response team
- Computer engineering
- Computer file
- Computer font
- Computer Fraud and Abuse Act
- Computer Go
- Computer graphics (computer science)
- Computer graphics
- Computer hardware
- Computer Incident Advisory Capability
- Computer keyboard
- Computer memory
- Computer monitor
- Computer mouse
- Computer multitasking
- Computer museum
- Computer network
- Computer operator
- Computer port (hardware)
- Computer Press Association
- Computer programming
- Computer science
- Computer Security Act of 1987
- Computer security
- Computer simulation
- Computer telephony integration
- Computer terminal
- Computer to plate
- Computer virus
- Computer worm
- Computer-aided design
- Computer-aided engineering
- Computer-aided software engineering
- Computer-integrated manufacturing
- Computer-mediated communication
- Computer
- Computex
- Computing
- Compuware
- Conacre
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- Concentrated solar power
- Concentration
- Concepción, Chile
- Concept
- Conceptions of God
- Conceptual art
- Concert dance
- Concert saloon
- Concert
- Concertgebouw
- Concerto for Two Violins (Bach)
- Concerto
- Concessions in China
- Conch
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- Concordance (publishing)
- Concordat of Worms
- Concorde
- Concrete category
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- Concrete
- Concretion
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- Condé Nast
- Condensation
- Condensed matter physics
- Condenser (laboratory)
- Conditional factor demands
- Conditional limitation
- Condorcet paradox
- Condottiero
- Cone cell
- Cone sisters
- Cone snail
- Cone
- Conegliano
- Confarreatio
- Confederate States of America
- Confederation Bridge
- Confederation of the Rhine
- Confederation
- Conference call
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- Confession and avoidance
- Confession of Basel
- Confessions (Augustine)
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- Confessions of an English Opium-Eater
- Confidence interval
- Confidence
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- Confirmation
- Conflict in the Niger Delta
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- Conflict resource
- Conflict theories
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- Conformal field theory
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- Conformational isomerism
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- Confucius
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- Congo Crisis
- Congo Free State
- Congo River
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- Congress of Afrikan People
- Congress of Aix-la-Chapelle (1748)
- Congress of Aix-la-Chapelle (1818)
- Congress of Berlin
- Congress of Laibach
- Congress of Verona
- Congress of Vienna
- Congruence (geometry)
- Conic section
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- Conifer
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- Connacht
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- Connecticut
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- Conoscopy
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- Conrad Busken Huet
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- Conrad Gessner
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- Conradin
- Conscience
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- Consciousness
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- Conseil de Famille
- Consejo Mundial de Lucha Libre
- Consequentialism
- Conservation biology
- Conservation law
- Conservation of energy
- Conservation of mass
- Conservatism in the United States
- Conservatism
- Conservative force
- Conservative Judaism
- Conservative Party (UK)
- Conservative Party of Canada
- Conservative vector field
- Conservator (religion)
- Conserved quantity
- Conshohocken, Pennsylvania
- Consideration
- Consignment
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- Consolation
- Consolidation bill
- Consolidation of Sweden
- Consonance and dissonance
- Consonant
- Conspiracy (criminal)
- Conspiracy theory
- Constance Fenimore Woolson
- Constance Garnett
- Constance Lindsay Skinner
- Constance Markievicz
- Constance Rourke
- Constans
- Constant (mathematics)
- Constant angular velocity
- Constant d'Aubigné
- Constant function
- Constant of integration
- Constant Prévost
- Constant Troyon
- Constanța
- Constantan
- Constantin Brâncoveanu
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- Constantin Meunier
- Constantin von Alvensleben
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- Constantine Anthopoulos
- Constantine Lascaris
- Constantine Manasses
- Constantine Mavrocordatos
- Constantine the African
- Constantine the Great and Christianity
- Constantine the Great
- Constantine, Algeria
- Constantinople Agreement
- Constantinople
- Constantinos Apostolou Doxiadis
- Constantius Chlorus
- Constellaria
- Constellation
- Constituent assembly
- Constitution Island
- Constitution of the United Kingdom
- Constitution of the United States
- Constitution
- Constitutional amendment
- Constitutional Commission
- Constitutional court
- Constitutional crisis
- Constitutional law
- Constitutional monarchy
- Constructed language
- Constructible function
- Constructible number
- Construction aggregate
- Construction engineering
- Construction
- Constructive trust
- Constructivism (art)
- Consul (representative)
- Consular assistance
- Consulate of the Sea
- Consulate
- Consumables
- Consumer electronics
- Consumer Reports
- Consumption tax
- Contact (geology)
- Contact fuze
- Contact geometry
- Contact list
- Contact mechanics
- Contactless smart card
- Contagious bovine pleuropneumonia
- Container format
- Container port
- Container ship
- Container
- Contarini
- Conté
- Contemporary art
- Contemporary ballet
- Contemporary Christian music
- Contemporary classical music
- Contemporary dance
- Contemporary history
- Contemporary philosophy
- Contemporary R&B
- Contempt
- Content creation
- Content delivery network
- Content-addressable memory
- Content-addressable storage
- Context-free grammar
- Context-sensitive help
- Contextual advertising
- Contextual searching
- Conti
- Continent
- Continental crust
- Continental Divide of the Americas
- Continental drift
- Continental fragment
- Continental margin
- Continental philosophy
- Continental Reformed Protestantism
- Continental rise
- Continental shelf
- Continental System
- Contingency (philosophy)
- Contingency plan
- Contingent work
- Continuation high school
- Continuation War
- Continued fraction
- Continuity (fiction)
- Continuity equation
- Continuous distillation
- Continuous function
- Continuous stationery
- Continuous stirred-tank reactor
- Continuous tone
- Continuous uniform distribution
- Continuum hypothesis
- Continuum mechanics
- Contortion
- Contour integration
- Contour line
- Contra dance
- Contraband
- Contrabass clarinet
- Contrabassoon
- Contract bridge
- Contract killing
- Contract of sale
- Contract
- Contraction (grammar)
- Contractual term
- Contralto
- Contraposition
- Contrastive linguistics
- Contrexéville
- Contrition
- Control break
- Control character
- Control Data Corporation
- Control engineering
- Control flow
- Control loop
- Control of fire by early humans
- Control Program Facility
- Control theory
- Control valve
- Control variable
- Controlled burn
- Controlled-access highway
- Contumacy
- Conurbation
- Convection (heat transfer)
- Convection zone
- Convection
- Convective instability
- Convent
- Convention (meeting)
- Convention of Klosterzeven
- Convention of Malvana
- Convention of Tauroggen
- Convention on the Rights of the Child
- Conventional memory
- Convergence tests
- Convergent boundary
- Convergent evolution
- Convergent series
- Convergent synthesis
- Conversation threading
- Conversation
- Conversations-Lexikon mit vorzüglicher Rücksicht auf die gegenwärtigen Zeiten
- Conversion (chemistry)
- Conversion (law)
- Conversion of units
- Conversion to Judaism
- Convertible bond
- Convertible
- Convertiplane
- Convex set
- Conveyancing
- Conveyor belt
- Conveyor system
- Conviction
- Convocations of Canterbury and York
- Convolution theorem
- Convolvulaceae
- Convolvulus scammonia
- Convolvulus
- Convulsion
- Cooch Behar district
- Cook (profession)
- Cook Islands
- Cook Strait
- Cookbook
- Cookiecutter shark
- Cooking apple
- Cooking banana
- Cooking oil
- Cooking weights and measures
- Cooking
- Cooksonia
- Cooktown, Queensland
- Coolgardie, Western Australia
- Cooling tower
- Cooloola (insect)
- Coop (Switzerland)
- Cooper (profession)
- Cooper Creek
- Cooper pair
- Cooperation
- Cooperative
- Coordinate system
- Coordination complex
- Coordination geometry
- Coordination number
- Coordination sphere
- Coot
- Coote
- Copaline
- Copenhagen interpretation
- Copenhagen Metro
- Copenhagen
- Copepod
- Copernicium
- Copiapó
- Coping (architecture)
- Coplanarity
- Copley Fielding
- Copper (color)
- Copper Canyon
- Copper(II) acetate
- Copper(II) sulfate
- Copper
- Coppicing
- Coprime integers
- Coprinus comatus
- Coproduct
- Coprolite
- Cops (TV program)
- Coptic history
- Coptic language
- Coptic Orthodox Church
- Coptotermes gestroi
- Copts
- Copy protection
- Copyleft
- Copyright infringement
- Copyright troll
- Copyright
- Coquerel
- Coquimbo Region
- Coquimbo
- Cor anglais
- Coraciidae
- Coral island
- Coral reef fish
- Coral reef
- Coral Sea
- Coral snake
- Coral
- Corato
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- Corbel
- Cord (unit)
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- Cordillera Blanca
- Córdoba Province, Argentina
- Córdoba, Argentina
- Córdoba, Spain
- Cordyceps
- Cordylidae
- Core sample
- Core–mantle boundary
- Coregonus
- Coreidae
- Corel Painter
- Coreless planet
- Corfinium
- Corfitz Ulfeldt
- Corfu (city)
- Corfu
- Cori, Lazio
- Coriander
- Corinth Canal
- Corinto, Nicaragua
- Corioli
- Coriolis force
- Corippus
- Corisco
- Corixidae
- Cork (city)
- Cormorant
- Corn harvester
- Corn snake
- Cornbrash Formation
- Cornea
- Cornelia gens
- Cornelis Cort
- Cornelis de Witt
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- Cornelis Tiele
- Cornelius Gallus
- Cornelius Jansen
- Cornelius Newton Bliss
- Cornelius van Bynkershoek
- Cornelius Varley
- Cornell University
- Cornet
- Cornish language
- Cornish Rex
- Cornu aspersum
- Cornucopia
- Cornus
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- Corollary
- Coromandel lacquer
- Corona Australis
- Corona Borealis
- Corona discharge
- Coronach
- Coronado Bay
- Coronado National Memorial
- Coronagraph
- Coronal mass ejection
- Coronary artery disease
- Coronation Carpet
- Coronation Street
- Coronavirus
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- Coroner
- Coronilla
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- Corporate capitalism
- Corporate crime
- Corporate farming
- Corporate finance
- Corporate governance
- Corporate law
- Corporate manslaughter
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- Corporation des Menuisiers-Ébénistes
- Corporation
- Corporatism
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- Corps législatif
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- Corpus Christi Bay
- Corpus Christi, Texas
- Corpus Juris Civilis
- Correa reflexa var. speciosa
- Correggio, Emilia-Romagna
- Correlation
- Correspondence principle
- Corrèze
- Corriente
- Corrientes Province
- Corrosion
- Corrupt practices
- Corruption
- Corsica
- Corsican donkey
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- Corsicana, Texas
- Corsini family
- Corsini
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- Corticosteroid
- Cortisol
- Çorum
- Corumbá
- Corundum
- Corvée
- Corvette
- Corvidae
- Corvo Island
- Corvus (constellation)
- Corvus
- Coryanthes
- Corylus maxima
- Coryphaeus
- Coryphodon
- Corythosaurus
- Cosa
- Cosimo Rosselli
- Cosmati
- Cosmè Tura
- Cosmic Background Explorer
- Cosmic censorship hypothesis
- Cosmic distance ladder
- Cosmic dust
- Cosmic microwave background
- Cosmic ray
- Cosmic wind
- Cosmochemistry
- Cosmogenic nuclide
- Cosmological argument
- Cosmological constant
- Cosmological horizon
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- Cosmopolitanism
- Cosmos bipinnatus
- Cosmotron
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- Cossacks
- Cossidae
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- Cost curve
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- Cost–benefit analysis
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- Cotton
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- Cotyledon
- Cotylorhynchus
- Coua
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- Cougar
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- Coulomb constant
- Coulomb excitation
- Coulomb explosion
- Coulomb's law
- Coulomb
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- Coumarin
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- Counsel
- Count Anton Alexander von Auersperg
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- Count Johann Bernhard von Rechberg und Rothenlöwen
- Count Johann Hartwig Ernst von Bernstorff
- Count Joseph Alexander Hübner
- Count key data
- Count of Foix
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- Count Richard Belcredi
- Count
- Counter-Reformation
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- Countercurrent chromatography
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- Counterpoint
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- Counting board
- Counting
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- Coup of 18 Fructidor
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- Coupled substitution
- Coupling Facility
- Coupling reaction
- Coupling
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- Court of piepowders
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- Cousin Bette
- Couvade
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- Cover version
- Covering relation
- Coverture
- COVID-19 pandemic
- COVID-19 recession
- COVID-19
- Covilhã
- Covin
- Cow shark
- Cowasji Jehangir Readymoney
- Cowboy Bebop
- Cowl
- Cownose ray
- Cowpea
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- Cowrie
- Cox's Bazar
- Coxeter graph
- Coyhaique
- Coyote (mythology)
- Coyote
- Coypel
- Cozzi porcelain
- CP violation
- CPT symmetry
- CPU-bound
- Crab louse
- Crab Nebula
- Crab Pulsar
- Crab trap
- Crab-eating macaque
- Crab
- Cracking (chemistry)
- Cradle of civilization
- Cradle of Humankind
- Cradock, Eastern Cape
- Craft production
- Craft
- Craigslist
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- Crambo
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- Cramp-ring
- Cranberry
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- Crane fly
- Crangon crangon
- Craniate
- Cranioceras
- Craniometry
- Crank–Nicolson method
- Cransac
- Cranston, Rhode Island
- Cranston
- Crantor
- Cranworth
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- Crater Lake
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- Crates of Mallus
- Crates
- Cratinus
- Craton
- Cratonic sequence
- Crawford Howell Toy
- Crayfish
- Creation myth
- Creation science
- Creationism (soul)
- Creationism
- Creative Commons
- Creative Market
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- Creativity
- Creator deity
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- Credence table
- Credential
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- Credible interval
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- Credit card
- Crediton
- Cree language
- Cree
- Creed
- Creetown
- Creil
- Crell
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- Cremation
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- Cremera
- Cremorne Gardens, London
- Crenulation
- Creole language
- Creole peoples
- Creosote
- Crêpe (textile)
- Crepis
- Crepuscolari
- Créquy family
- Créquy
- Crescens
- Cressida
- Crested caracara
- Crested mangabey
- Crested penguin
- Creswick, Victoria
- Cretaceous–Paleogene boundary
- Cretaceous–Paleogene extinction event
- Cretaceous
- Cretan Bull
- Cretan War (1645–1669)
- Crete
- Cretonne
- Cretoxyrhina
- Creusa
- Creutzfeldt–Jakob disease
- Crevasse
- Crevillent
- Crib talk
- Cricket (insect)
- Cricket frog
- Crime and Punishment
- Crime fiction
- Crime film
- Crime of aggression
- Crime of apartheid
- Crime prevention
- Crime
- Crimea
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- Crimean Khanate
- Crimean War
- Crimes against humanity under communist regimes
- Crimes against humanity
- Criminal conversion
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- Criminal justice
- Criminal law
- Criminal procedure
- Criminalization of homosexuality
- Criminology
- Crimmitschau
- Crinagoras of Mytilene
- Crinoid
- Crinozoa
- Criobolium
- Criollismo
- Crippleware
- Crips
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- Crisis of the Late Middle Ages
- Crisis of the Roman Republic
- Crisis of the Third Century
- Crispin and Crispinian
- CRISPR
- Crispus
- Cristino Martos y Balbí
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- Cristóbal
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- Cristóvão Falcão
- Critical mass
- Critical opalescence
- Critical phenomena
- Critical point (mathematics)
- Critical point (thermodynamics)
- Critical thinking
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- Criticism
- Critique of Pure Reason
- Crito
- Critolaus
- Croatia in personal union with Hungary
- Croatia
- Croatian language
- Crochet
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- Crocodile
- Crocodilia
- Crocoite
- Crocotta
- Crocus
- Croft (land)
- Crofting
- Cromaclear
- Cromarty Firth
- Cromarty
- Cromorne
- Cromwellian conquest of Ireland
- Cron
- Cronje
- Crop rotation
- Crop yield
- Crop
- Croquet
- Cross product
- Cross River gorilla
- Cross River State
- Cross section (physics)
- Cross-bedding
- Cross-browser compatibility
- Cross-correlation
- Cross-cultural communication
- Cross-examination
- Cross-flow filtration
- Cross-promotion
- Crossbar switch
- Crossbill
- Crossbow
- Crossing number (graph theory)
- Crossing number inequality
- Crossover cable
- Crossposting
- Crossroads (British TV series)
- Croton (plant)
- Croton oil
- Crotone
- Crotonic acid
- Crouching Tiger, Hidden Dragon
- Croup
- Crow
- Crowbar
- Crowea saligna
- Crown (dental restoration)
- Crown debt
- Crown jellyfish
- Crown of Aragon
- Crown-of-thorns starfish
- Crowned pigeon
- Crowns of Egypt
- Crozet Islands
- CRRC
- Crucible
- Crucifix
- Crucifixion of Jesus
- Crucifixion thorn
- Crucifixion
- Cruden
- Cruelty
- Cruise missile
- Cruise ship
- Cruiser
- Crumhorn
- Crusader states
- Crusades
- Crusher
- Crust (geology)
- Crustacean
- Crustumerium
- Crux
- Cry, the Beloved Country
- Cryosphere
- Crypt
- Cryptanalysis
- Cryptanthus
- Cryptoblastus
- Cryptoclidus
- Cryptococcosis
- Cryptocurrency
- Cryptogam
- Cryptography
- Cryptolithus
- Cryptomonad
- Cryptophyceae
- Cryptopidae
- Cryptoporticus
- Cryptostomata
- Cryptozoology
- Crystal engineering
- Crystal field theory
- Crystal gazing
- Crystal growth
- Crystal optics
- Crystal oscillator
- Crystal Palace Dinosaurs
- Crystal radio
- Crystal skull
- Crystal structure
- Crystal system
- Crystal the Monkey
- Crystal twinning
- Crystal violet
- Crystal
- Crystallite
- Crystallization
- Crystallographic defect
- Crystallography
- CS gas
- Csaba
- Csárdás (Monti)
- CSI: Crime Scene Investigation
- Csongrád-Csanád County
- CSS
- CT scan
- Ctenophora
- Ctesias
- Ctesiphon
- Cthulhu Mythos
- Cthulhu
- Cú Chulainn
- Cuautitlán Izcalli
- Cuba
- Cuban Missile Crisis
- Cuban Revolution
- Cuban rumba
- Cube root
- Cube
- Cubic centimetre
- Cubic crystal system
- Cubic foot
- Cubic function
- Cubic inch
- Cubic metre per second
- Cubic metre
- Cubic mile
- Cubic yard
- Cubism
- Cubit
- Cucking stool
- Cuckoo bee
- Cuckoo-roller
- Cuckoo
- Cucumber
- Cucumis melo
- Cucumis metuliferus
- Cucurbita foetidissima
- Cucurbita
- Cucurbitaceae
- Cúcuta
- Cucuteni–Trypillia culture
- Cuddalore
- Cuenca, Ecuador
- Cueva de las Manos
- Cuevas del Almanzora
- Cuff
- Cuiabá
- Cuirass
- Culcita (echinoderm)
- Culdees
- Culex
- Culiacán
- Cullera
- Culling
- Culloden, Highland
- Culmination
- Culprit
- Cult (religious practice)
- Cult image
- Cult of personality
- Cult
- Cultivar
- Cultivator
- Cultural anthropology
- Cultural assimilation
- Cultural conservatism
- Cultural emphasis
- Cultural history
- Cultural Revolution
- Cultural studies
- Culture of Africa
- Culture of Asia
- Culture of Australia
- Culture of Buddhism
- Culture of Europe
- Culture of Japan
- Culture of Nepal
- Culture of North America
- Culture of South America
- Culture
- Cumacea
- Cumae
- Cumaná
- Cumania
- Cumans
- Cumberland River
- Cumberland
- Cumbria
- Cumin
- Cummingtonite
- Cummins Jackson
- Cumnock and Holmhead
- Cumulative distribution function
- Cumulonimbus cloud
- Cumulus cloud
- Cumulus congestus cloud
- Cumulus humilis cloud
- Cumulus mediocris cloud
- Cuneiform
- Cuneus
- Cuniculture
- Cup (unit)
- Cupboard
- Cupressus
- Ćuprija
- Cupronickel
- Cups and balls
- Cupuliferae
- Cura Annonae
- Curaçao
- Curassow
- Cures, Sabinum
- Curetes (tribe)
- Cureton
- Curia regis
- Curicó
- Curie (unit)
- Curie temperature
- Curiosity (rover)
- Curiosity
- Curitiba
- Curium
- Curl (mathematics)
- Curlew
- Curll
- Curonian Lagoon
- Curonian Spit
- Currency band
- Currency packaging
- Currency symbol
- Currency union
- Currency
- Current density
- Current source
- Curricle
- Curriculum vitae
- Curriculum
- Curry tree
- Curse
- Cursive
- Cursor (user interface)
- Curt Richter
- Curtain wall (fortification)
- Curtana
- Curtea de Argeș Cathedral
- Curtea de Argeș
- Curtilage
- Curtis F. Marbut
- Curule seat
- Curvature
- Curve
- Curved mirror
- Cusco
- Cuscuta
- Cushman Kellogg Davis
- Cusk-eel
- Customary freehold
- Customary law
- Customer relationship management
- Customer service representative
- Customs
- Custos rotulorum
- Custoza
- Cut bank
- Cut glass
- Cut, copy, and paste
- Cuthbert Collingwood, 1st Baron Collingwood
- Cuthbert Tunstall
- Cutibacterium acnes
- Cuticle
- Cutlass
- Cuttack
- Cuttlefish
- Cuvier's dwarf caiman
- Cuyapo
- Cuyp
- CW Leonis
- Cy-près doctrine
- Cyan
- Cyanamide
- Cyanide
- Cyanobacteria
- Cyanogen
- Cybele
- Cyberbullying
- Cybercrime
- Cybernetics
- Cyberpunk
- Cybersquatting
- Cyberwarfare
- Cyborg
- Cycad
- Cyclades
- Cyclanthaceae
- Cycle (graph theory)
- Cycle track
- Cyclic compound
- Cyclic model
- Cyclic voltammetry
- Cycling infrastructure
- Cycloaddition
- Cycloalkane
- Cyclobutane
- Cyclohexane conformation
- Cyclohexane
- Cycloid
- Cyclometer
- Cyclone Tracy
- Cyclone
- Cyclonic separation
- Cyclopean masonry
- Cyclopentane
- Cyclopes
- Cyclophyllidea
- Cyclopropane
- Cyclopteridae
- Cyclostomi
- Cyclotron radiation
- Cyclotron resonance
- Cycolor
- Cygnus (constellation)
- Cygnus A
- Cygnus Loop
- Cygnus X-1
- Cylinder
- Cylindrical coordinate system
- Cymatiidae
- Cymbal
- Cymbopogon
- Cynegils
- Cynodon
- Cynodont
- Cyperaceae
- Cyprinidae
- Cypriniformes
- Cyprinodontiformes
- Cyprus
- Cyrano de Bergerac (play)
- Cyrenaics
- Cyrene, Libya
- Cyril Hazard
- Cyril Lucaris
- Cyril Maude
- Cyril Tourneur
- Cyrillic alphabets
- Cyrillic script
- Cyrillization
- Cyrillus
- Cyrix
- Cyropaedia
- Cyrus Edwin Dallin
- Cyrus McCormick
- Cyrus the Great
- Cyrus the Younger
- Cysteine
- Cystolith
- Cytokine
- Cytokinin
- Cytoplasm
- Cytosine
- Cytoskeleton
- Cytosol
- Cyzicus
- Czech language
- Czech literature
- Czech Republic
- Czech Silesia
- Czechoslovakia
- Częstochowa
- D-subminiature
- D. F. Malherbe
- Da Ali G Show
- Da Lat
- Da Nang
- DA-88
- Dabbasheth
- Daberath
- Dabke
- Daboia
- Dachshund
- Dacia
- Dacians
- Dacite
- Dacke War
- Dacryocystitis
- Dactylella
- Dactyloidae
- Dad's Army
- Dada
- Daddy (poem)
- Dadès Gorges
- Dado rail
- Dae Jang Geum
- Daedala
- Daegis Inc.
- Daegu
- Daejeon
- Daeng Parani
- Daeodon
- Daeva
- Dafydd ab Edmwnd
- Dafydd Nanmor
- Dagestan
- Dagger-axe
- Dagger
- Dagupan
- Dahabeah
- Dahlak Archipelago
- Dahlia
- Dahomey
- Daikon
- Daily Mail
- Daimiel
- Daines Barrington
- Dainik Bhaskar
- Dainik Jagran
- Dairy cattle
- Dairy farming
- Dairy machinery
- Dairy
- Dais
- Daisetsuzan National Park
- Daisetsuzan Volcanic Group
- Daisy chain (electrical engineering)
- Daisy wheel printing
- Dakahlia Governorate
- Dakar
- Dakhla Oasis
- Dakin's solution
- Dál Riata
- Dalaguete
- Dalai Lama
- Dalberg
- Dalbergia
- Dale Chihuly
- Dali City
- Dali Kingdom
- Dalian Bay
- Dalian
- Dalit
- Dall sheep
- Dall's porpoise
- Dallán Forgaill
- Dallas (1978 TV series)
- Dallas–Fort Worth metroplex
- Dallas
- Dallasaurus
- Dallol (hydrothermal system)
- Dalmatian (dog)
- Dalmellington
- Daloa
- Dalradian
- Dalton (unit)
- Dalton Plan
- Dalton-in-Furness
- Dalziel
- Dam
- Dama gazelle
- Damages
- Damaliscus
- Damanhur
- Damara people
- Damaraland
- Damascening
- Damascius
- Damascus steel
- Damascus
- Damask
- Damaturu
- Damavand, Iran
- Damba
- Dambadeniya
- Dambulla
- Damdin Sükhbaatar
- Dame
- Damghan
- Damià Forment
- Damião de Góis
- Damietta Governorate
- Damietta
- Damjanić
- Dammam
- Dammartin-en-Goële
- Damoh
- Damon Runyon
- Damophon
- Damping off
- Damping
- Damselfish
- Damselfly
- Damu
- Dan Andersson
- Dan Bricklin
- Dan Emmett
- Dan Michel of Northgate
- Dan Miron
- Dan Patch
- Dan Rice
- Dan Takuma
- Danapur
- Danburite
- Dance (Matisse)
- Dance improvisation
- Dance music
- Dance notation
- Dance
- Dancehall
- Dancing Girl (sculpture)
- Dancing Queen
- Dandakaranya
- Dandie Dinmont Terrier
- Dandolo
- Dandong
- Danegeld
- Danelaw
- Dangerous goods
- Dangote Group
- Dani Karavan
- Daniachew Worku
- Daniel (biblical figure)
- Daniel Albert Wyttenbach
- Daniel Appleton
- Daniel Auber
- Daniel Berkeley Updike
- Dániel Berzsenyi
- Daniel Bliss
- Daniel Bomberg
- Daniel Bovet
- Daniel C. Jackling
- Daniel Casper von Lohenstein
- Daniel Chodowiecki
- Daniel Dunglas Home
- Daniel Ernst Jablonski
- Daniel Featley
- Daniel Finch, 2nd Earl of Nottingham
- Daniel Gabriel Fahrenheit
- Daniel Garrison Brinton
- Daniel Georg Morhof
- Daniel Gregory Mason
- Daniel Hack Tuke
- Daniel Harvey Hill
- Daniël Heinsius
- Daniel Huntington (artist)
- Daniel Maclise
- Daniel Macnee
- Daniel Mazia
- Daniel Neal
- Daniel Pierce Thompson
- Daniel Quare
- Daniel Ridgway Knight
- Daniel Rock
- Daniel Schenkel
- Daniel Sharpe
- Daniel Sickles
- Daniel Steibelt
- Daniel Vierge
- Daniel W. Voorhees
- Daniele Crespi
- Daniele da Volterra
- Daniele Manin
- Daniell cell
- Daniello Bartoli
- Danionin
- Danish colonization of the Americas
- Danish language
- Danish literature
- Danish overseas colonies
- Dannecker
- Danse macabre (Saint-Saëns)
- Dante Alighieri
- Danube–Black Sea Canal
- Danube
- Danyang–Kunshan Grand Bridge
- Dao (Chinese sword)
- Daonella
- Daozang
- Daphla Hills
- Daphnephoria
- Daphniphyllales
- Daphnis and Chloe
- Daqing
- Daqiqi
- Dar es Salaam
- Dara Island
- Darab
- Darbhanga
- Darcy Ribeiro
- Dard Hunter
- Dardanelles
- Dardic languages
- Daredevils of Sassoun
- Dares Phrygius
- Dargai
- Daria
- Darial Gorge
- Dariel
- Darién Gap
- Darius N. Couch
- Darius the Great
- Darius the Mede
- Darjeeling
- Dark energy
- Dark flow
- Dark galaxy
- Dark matter halo
- Dark matter
- Dark nebula
- Dark retreat
- Dark Shadows
- Dark web
- Darker than Black
- Darkness at Noon
- Darley Arabian
- Darling River
- Darling Scarp
- Darlington transistor
- Darmesteter
- Darmstadtium
- Darnell's Case
- Darqawiyya
- Darrang district
- Darriwilian
- Darter
- Darth Vader
- Dartmoor
- Dartmouth College v. Woodward
- Dartmouth College
- Darwin Rise
- Darwin–Radau equation
- Darwin, Northern Territory
- Darwin's finches
- Darwin's frog
- Darwinius
- Das Kapital
- Das Rheingold
- Dash
- Dashakumaracharita
- Dashava
- Dashpot
- Dasht-e Kavir
- Dasht-e Lut
- Daşoguz
- Dassault Rafale
- Dasycladales
- Dasyuridae
- Dasyuromorphia
- Data (computer science)
- Data administration
- Data analysis
- Data and information visualization
- Data center
- Data cluster
- Data collection
- Data communication
- Data compression
- Data corruption
- Data definition language
- Data Facility Storage Management Subsystem (MVS)
- Data item
- Data library
- Data mining
- Data model
- Data parallelism
- Data recovery
- Data reduction
- Data remanence
- Data science
- Data sharing
- Data sheet
- Data storage
- Data striping
- Data structure
- Data system
- Data Terminal Ready
- Data
- Database machine
- Database normalization
- Database
- Dataquest
- DataWorks Plus
- Date palm
- Date rape
- Date windowing
- Datia
- Datolite
- Datong
- Datura stramonium
- Daugava
- Daugavpils
- Daughters of the American Revolution
- Davanagere
- Davao City
- Davao Region
- David (Donatello)
- David (Michelangelo)
- David Ames Wells
- David Beaton
- David Beck
- David Bogue
- David Brainerd
- David Brewster
- David Calderwood
- David Charles Davies
- David Copperfield
- David d'Angers
- David Dalhoff Neal
- David Dalrymple, Lord Hailes
- David Dudley Field II
- David Forbes (mineralogist)
- David Gray (poet)
- David Hartley (philosopher)
- David Hayes Agnew
- David I of Scotland
- David II of Scotland
- David Joris
- David Leslie, 1st Lord Newark
- David Lindsay, 1st Duke of Montrose
- David Macbeth Moir
- David Masson
- David Monro (scholar)
- David Ochterlony
- David Ramsay (historian)
- David Reeb
- David Rizzio
- David Roberts (painter)
- David Roentgen
- David Ruhnken
- David Shahar
- David Strauss
- David Swing
- David T. Ansted
- David Teniers the Elder
- David Teniers the Younger
- David Urquhart
- David Wilmot
- David's Mighty Warriors
- David
- Davis Rich Dewey
- Davis Sea
- Davis Strait
- Davisson–Germer experiment
- Dawar (Pashtun tribe)
- Dawlish
- Dawn
- Dawson's Creek
- Day of the Dead
- Day's journey
- Day
- Daylight saving time
- Daylight
- Days of Our Lives
- Daytime Emmy Awards
- Daytime
- Dayton, Ohio
- DBOMP
- DC Comics
- DDT
- De (Chinese)
- De Brazza's monkey
- De Camp
- De donis conditionalibus
- De Haas
- De Havilland Canada Dash 8
- De Havilland Comet
- De Jussieu family
- De la Rive
- De la Rochejacquelein
- De la Rue (surname)
- De La Salle Brothers
- De Long Islands
- De Officiis
- De Oratore
- De Pere, Wisconsin
- De rerum natura
- De revolutionibus orbium coelestium
- De Stijl
- De Vere
- De Vriendt brothers
- De Wet
- De Young Museum
- De-extinction
- Dead bolt
- Dead leaf mantis
- Dead Media Project
- Dead reckoning
- Dead Sea Scrolls
- Dead Sea
- Dead Souls
- Deadlock
- Deadpool
- Deadwood (TV series)
- Deaf-mute
- Deafness
- Deal or No Deal (American game show)
- Dean–Stark apparatus
- Death (personification)
- Death by boiling
- Death by burning
- Death metal
- Death Note
- Death of a Salesman
- Death of Azaria Chamberlain
- Death of James Cook
- Death Rite
- Death Valley National Park
- Death Valley
- Death-Watch
- Death
- Deathstalker
- Deba, Gombe
- Debate
- Debenture
- Debir
- Debit card
- Deborah Moody
- Debrecen
- Debris disk
- Debt
- Debugging
- Debye length
- Debye model
- Debye–Falkenhagen effect
- Debye–Hückel equation
- Decade
- Decadent movement
- Decagon
- Decapoda
- Decay chain
- Decay energy
- Decay product
- Decazeville
- Deccan Plateau
- Deccan sultanates
- Deccan Traps
- Deceleration parameter
- December
- Decembrist revolt
- Decemviri
- Decentralization
- Deception (criminal law)
- Decibel
- Deciduous
- Decimal separator
- Decimal
- Decimalisation
- Decimus Laberius
- Děčín
- Decision problem
- Decius
- Decize
- Deck tennis
- Deck the Halls
- Declaration of Interdependence
- Declaration of Sports
- Declaration of the Rights of Man and of the Citizen
- Declarative programming
- Declarator
- Declension
- Declination
- Decline of Buddhism in the Indian subcontinent
- DECmate
- Décollement
- Decolonisation of Africa
- Decolonisation of Oceania
- Decolonization of Asia
- Decolonization of the Americas
- Decolonization
- Decomposer
- Decomposition
- Decorative arts
- Decree of Muharram
- Decree
- Decretal
- Decretum Gratiani
- DECtalk
- Decurio
- Ded Moroz
- Dedication
- Deductive reasoning
- Deductive-nomological model
- Deep Blue (chess computer)
- Deep sea mining
- Deep South
- Deep state
- Deep Throat (film)
- Deep web
- Deep-focus earthquake
- Deep-sea exploration
- Deep-sea fish
- Deer fly
- Deer
- Deerfield River
- DEET
- Defamation
- Defeasance
- Defence of the Reich
- Defendant
- Defense (legal)
- Defense Data Network
- Defense Intelligence Agency
- Defensive wall
- Defensor pacis
- Defibrillation
- Deficit round robin
- Definition of planet
- Deflation
- Defoliant
- Deforestation and climate change
- Deforestation of the Amazon rainforest
- Deforestation
- Deformation (engineering)
- Deformation (physics)
- Defragmentation
- Degaussing
- Degenerate energy levels
- Degenerate matter
- Deggendorf
- Degradation (geology)
- Degrassi
- Degree (angle)
- Degree (graph theory)
- Degree day
- Degree matrix
- Degree of unsaturation
- Degrees of freedom (mechanics)
- Degrees of freedom
- Dehiwala-Mount Lavinia
- Dehradun
- Dehri
- Dehydration
- Deimos (moon)
- Deinocheirus
- Deinonychus
- Deinosuchus
- Deinotherium
- Deinterlacing
- Deiotarus
- Deiphon
- Deir ez-Zor
- Deirdre of the Sorrows
- Deism
- Deister
- Deity
- Del City, Oklahoma
- Del credere
- Del Monte Foods
- Del
- Delaborde
- Delafossite
- Delator
- Delavigne
- Delaware Colony
- Delaware River
- Delaware Water Gap National Recreation Area
- Delaware
- Delay equalization
- Delayed binding
- Delémont
- Delete key
- Delft University of Technology
- Delft
- Delhi Metro
- Delhi Sultanate
- Delhi
- Delia
- Delian League
- Delicate Arch
- Delichon
- Delict
- Delilah
- Deliming
- Delimiter
- Delium
- Deliverable
- Dell Wyse
- Dell
- Della Cruscans
- Della Fox
- Della Gherardesca family
- Della Robbia
- Dells of the Wisconsin River
- Delmarva Peninsula
- Delmira Agustini
- Delocalized electron
- Deloitte
- Delphi (online service)
- Delphi (software)
- Delphi
- Delphine de Girardin
- Delphinia
- Delphinus
- Delta Air Lines
- Delta Barrage
- Delta baryon
- Delta modulation
- Delta potential
- Delta ray
- Delta Scuti variable
- Delta State
- Delta Works
- Delusion
- Dema Deity
- Demades
- Demagogue
- Demand factor
- Demand response
- Demand-chain management
- Demand-responsive transport
- Demantoid
- Demarcation point
- Demarcation problem
- Demas
- Dementia
- Demersal fish
- Demesne
- Demeter
- Demetrios Chalkokondyles
- Demetrios Kydones
- Demetrios Ypsilantis
- Demetrius (biblical figure)
- Demetrius I of Macedon
- Demetrius I Soter
- Demetrius II Aetolicus
- Demetrius II Nicator
- Demetrius the Cynic
- Demetrius Triclinius
- Demetrius
- Demi's Birthday Suit
- Demidov
- Demigod
- Demise
- Demmin
- Demo (music)
- DEMO conference
- Demochares
- Democracy in America
- Democracy Now!
- Democracy
- Democratic Kampuchea
- Democratic Party (United States)
- Democratic Republic of Afghanistan
- Democratic Republic of the Congo
- Democratic socialism
- Demodulation
- Demographics of atheism
- Demographics of the Philippines
- Demography
- Demoiselle crane
- Demon
- Demons (Dostoevsky novel)
- Demoscene
- Demosponge
- Demurrage
- Demyan Bedny
- Denain
- Denali
- Denaturalization
- Dendera
- Dendermonde
- Dendrimer
- Dendrite
- Dendritic cell
- Dendroceratida
- Dendrochronology
- Dendrocometes
- Deneb
- Denehole
- Dengue fever
- Denial-of-service attack
- Deniliquin
- Denim
- Denis Auguste Affre
- Denis Calvaert
- Denis de Rougemont
- Denis de Sallo
- Denis Diderot
- Denis Gaultier
- Denis Hamilton
- Denis Jean Achille Luchaire
- Denis Lambin
- Denis Parsons Burkitt
- Denis Pétau
- Denis the Carthusian
- Denis William Brogan
- Denis-Luc Frayssinous
- Denison Dam
- Denison Olmsted
- Denisovan
- Denitrifying bacteria
- Denizli
- Denkyira
- Denmark Strait
- Denmark–Norway
- Denmark
- Dennery District
- Dennewitz
- Dennis Brutus
- Dennis Hastert
- Dennis Robert Hoagland
- Dennis the Menace (1959 TV series)
- Denpasar
- Density (computer storage)
- Density functional theory
- Density of states
- Density wave theory
- Density
- Dental auxiliary
- Dental avulsion
- Dental braces
- Dental extraction
- Dental floss
- Dental implant
- Dental plaque
- Dental restoration
- Dental surgery
- Dental trauma
- Dentil
- Dentist
- Dentistry
- Dents du Midi
- Dentures
- Denver
- Đèo Văn Trị
- Deodand
- Déodat Gratet de Dolomieu
- Deodorant
- Deodoro da Fonseca
- Déols
- Deontology
- Deosai Mountains
- Deoxyribose
- Department (administrative division)
- Department for the Economy
- Department of Ancash
- Department of motor vehicles
- Department of transportation
- Department store
- Departments of Bolivia
- Departments of Colombia
- Departments of Paraguay
- Departments of the Republic of the Congo
- Departments of Uruguay
- Dependent personality disorder
- Dependent territory
- Dependoparvovirus
- Depletion (accounting)
- Deployment environment
- Depok
- Deposition (geology)
- Deposition (law)
- Deposition (phase transition)
- Depot
- Deprecation
- Depressant
- Depression (geology)
- Depression (mood)
- Depressive personality disorder
- Deprotonation
- Depth charge
- Depth-first search
- Der Blaue Reiter
- Der Ring des Nibelungen
- Der Rosenkavalier
- Der Spiegel
- Der Sturm
- Der von Kürenberg
- Dera Ghazi Khan
- Dera Ismail Khan
- Dera
- Derailleur
- Derbe
- Derbent
- Derby
- Derbyshire
- Dereference operator
- Derivative (finance)
- Derivative
- Derivatives market
- Dermatology
- Dermatophytosis
- Dermis
- Dermott's law
- Derris
- Derry
- Des Moines, Iowa
- Des racines et des ailes
- Desalination
- Deschamps
- Deschanel
- Descloizite
- Description
- Descriptive ethics
- Descriptive poetry
- Descriptor (chemistry)
- Desegregation busing
- Desegregation in the United States
- Desert climate
- Desert farming
- Desert island
- Desert Orchid
- Desert
- Desertification
- Desertion
- Deserts and xeric shrublands
- Desiccant
- Desiderius
- Design of experiments
- Design optimization
- Design
- Désiré Charnay
- Désiré Nisard
- Desiré-Raoul Rochette
- Désirée potato
- Deskilling
- Desktop computer
- Desktop publishing
- Deslongchamps
- Desman
- Desmodorida
- Desmostylia
- Desnoyers
- Desperate Housewives
- Dessert spoon
- Dessewffy
- Destroyer
- Destructive distillation
- Detachment fault
- Detainer
- Detective fiction
- Detergent
- Determinant
- Determiner
- Determinism
- Deterministic algorithm
- Detinue
- Detlev von Liliencron
- Detonator
- Detrital zircon geochronology
- Detritivore
- Detroit Industry Murals
- Detroit
- Dettifoss
- Deuterium-depleted water
- Deuterium
- Deuterocanonical books
- Deuterostome
- Deutsch-Wagram
- Deutsche Bahn
- Deutsche Bank
- Deutsche Welle
- Deutsches Institut für Normung
- Deutsches Museum
- Deutschlandlied
- Deux-Sèvres
- Devanagari
- Developed country
- Developing country
- Development of the human body
- Developmental biology
- Developmental psychology
- Deviance (sociology)
- DeviantArt
- Device driver
- Device file
- Devil
- Devils Tower
- Devon Island
- Devon Rex
- Devon
- Devonian
- Devprayag
- Devrient
- Dew
- Dewan
- Dewas
- Dewberry
- Dewclaw
- Dewey Decimal Classification
- Dewlap
- Dexippus
- Dexter (TV series)
- Dexter cattle
- Dexter's Laboratory
- Dextropropoxyphene
- Dezful
- Dezső Bánffy
- Dhaka Division
- Dhaka
- Dhamar, Yemen
- Dhammapāla
- Dhanbad
- Dhar
- Dharamshala
- Dharma
- Dharmakāya
- Dharmawangsa
- Dharwad
- Dhiban, Jordan
- Dhol
- Dhole
- Dholpur State
- Dholpur
- Dhoop Kinare
- Dhrangadhra
- Dhule
- Diabase
- Diabetes
- Diablo 630
- Diaconicon
- Diacritic
- Diadectes
- Diadematacia
- Diadematoida
- Diadochos of Photiki
- Diagenesis
- Diagnosis
- Diagnostic board
- Dial-on-demand routing
- Dial-up Internet access
- Dialect
- Dialectic
- Dialling (telephony)
- Dialogue Concerning the Two Chief World Systems
- Dialogue
- Dialysis (chemistry)
- Diamagnetism
- Diamantino
- Diamaré
- Diammonium phosphate
- Diamond dust
- Diamond Harbour
- Diamond Sutra
- Diamond
- Diamondback moth
- Diamondback terrapin
- Diana (mythology)
- Diana Ross
- Diana, Princess of Wales
- Diane Ackerman
- Dianne Holum
- Dianthus caryophyllus
- Dianthus
- Diapause
- Diapensiaceae
- Diapir
- Diapsid
- Diarmaid mac Murchadha
- Diarrhea
- Diarthrognathus
- Diary of a Madman (Lu Xun)
- Diary
- Diaspora
- Diaspore
- Diastem
- Diastereomer
- Diatom
- Diatomic molecule
- Diazepam
- Diazo
- Diazonium compound
- Dibatag
- Dibba Al-Hisn
- Diborane
- Dibotryon morbosum
- Dibra
- Dibrugarh
- Dice
- Dicey
- Dichelostemma ida-maia
- Dichlorine monoxide
- Dichlorodifluoromethane
- Dichloromethane
- Dichondra
- Dichroism
- Dichromacy
- Dick Armey
- Dick Gephardt
- Dick Tracy
- Dick Turpin
- Dickinson W. Richards
- Dickinsonia
- Dicky Wells
- Dicotyledon
- Dicranales
- Dictation machine
- Dictator
- Dictatorship
- Dictionary of National Biography
- Dictionary
- Dictyoceratida
- Dictyostelium discoideum
- Dictys Cretensis
- Dicuil
- Dicynodon
- Dicynodont
- Didache
- Didacticism
- Didascaly
- Didelphodon
- Didgeridoo
- Didius Julianus
- Dido
- Didyma
- Didymograptus
- Didymoteicho
- Didymus Chalcenterus
- Didymus the Blind
- Die Burger
- Die casting
- Die Fledermaus
- Die Hard
- Die Meistersinger von Nürnberg
- Die Walküre
- Die Welt
- Die Zeit
- Diebitsch
- Dieffenbachia
- Diego Clemencín
- Diego de Almagro
- Diego de Saavedra Fajardo
- Diego de San Pedro
- Diego de Torres Villarroel
- Diego de Valera
- Diego de Vargas
- Diego Duque de Estrada
- Diego García de Paredes
- Diego Garcia
- Diego Laynez
- Diego Portales
- Diego Sarmiento de Acuña, Count of Gondomar
- Diego Siloe
- Diego Velázquez
- Diekirch
- Dieldrin
- Dielectric heating
- Dielectric spectroscopy
- Dielectric
- Diels–Alder reaction
- Điện Biên Phủ
- Dieng Plateau
- Diergaarde Blijdorp
- Dieric Bouts
- Dies irae
- Diesel cycle
- Diesel engine
- Diesel fuel
- Diesel locomotive
- Diet (nutrition)
- Dietary supplement
- Diethyl ether
- Dietitian
- Dietrich Heinrich von Bülow
- Dietrich of Nieheim
- Difference engine
- Differentiable function
- Differential (mathematics)
- Differential (mechanical device)
- Differential backup
- Differential calculus
- Differential equation
- Differential form
- Differential geometry
- Differential operator
- Differential psychology
- Differential pulse-code modulation
- Differentiated services
- Differentiation of trigonometric functions
- Differentiation rules
- Differentiator
- Diffie–Hellman key exchange
- Difflugia
- Diffraction grating
- Diffraction-limited system
- Diffraction
- Diffuse reflection
- Diffusion equation
- Diffusion
- Digambara
- Digest (Roman law)
- Digestion
- Digit (unit)
- Digital art
- Digital Audio Tape
- Digital buffer
- Digital clock
- Digital currency
- Digital electronics
- Digital humanities
- Digital media use and mental health
- Digital media
- Digital multimedia broadcasting
- Digital painting
- Digital paper
- Digital pen
- Digital photo frame
- Digital photography
- Digital Revolution
- Digital rights management
- Digital rights
- Digital signal processor
- Digital signal
- Digital signature
- Digital single-lens reflex camera
- Digital television
- Digital Terrestrial Multimedia Broadcast
- Digital Video Broadcasting
- Digital video effect
- Digital video recorder
- Digital Visual Interface
- Digital wallet
- Digital watermarking
- Digital-S
- Digital-to-analog converter
- Digitaria
- Digitata (band)
- Digitoxin
- Diglossia
- Dignity
- Digoin
- Digul
- Dihedral angle
- Dijkstra's algorithm
- Dijon
- Dik-dik
- Dike (geology)
- Dikelocephalus
- Dikka
- Dikwa
- Dilapidation
- Dilbert
- Dilemma story
- Dilemma
- Dili
- Diligence
- Dill
- Dillen
- Dilleniidae
- Dillinger (bull)
- Dilmun
- Dilophosaurus
- Diluvium
- Dilwale Dulhania Le Jayenge
- Dimapur
- Dimbokro
- Dime museum
- Dimension
- Dimensional analysis
- Dimensioning
- Dimethoate
- Dimethyl ether
- Dimethyl sulfoxide
- Dimethylformamide
- Dimetrodon
- Dimitri Mitropoulos
- Dimitrie Cantemir
- Dimitrie Sturdza
- Dimitrios Kallergis
- Dimity
- Dimorphic fungus
- Dimorphodon
- Dimorphotheca ecklonis
- Dina Thanthi
- Dinah Craik
- Dinajpur
- Dinan
- Dinant
- Dinantian
- Dinar, Afyonkarahisar
- Dinarchus
- Dinder National Park
- Dinder River
- Dindigul
- Dindsenchas
- Ding ware
- Dingo
- Dinguiraye
- Đinh Bộ Lĩnh
- Dini Ya Msambwa
- Dinichthys
- Dining room
- Diniz
- Dinkar Rao
- Dinkelsbühl
- Dino Compagni
- Dinocaridida
- Dinocephalia
- Dinocerata
- Dinocrates
- Dinofelis
- Dinoflagellate
- Dinornis
- Dinosaur Provincial Park
- Dinosaur
- Dinshaw Maneckji Petit
- Dio Chrysostom
- Diocese of Sodor and Man
- Diocese
- Diocletian
- Diodati
- Diode bridge
- Diode
- Diodorus Cronus
- Diodotus
- Dioecy
- Diogenes Laertius
- Diogenes
- Diogenianus
- Diogo Cão
- Diogo de Paiva de Andrade
- Diogo Gomes
- Diol
- Diomed
- Dion Boucicault
- Dion of Syracuse
- Dione (moon)
- Dionisio Anzilotti
- Dionysius bar Salibi
- Dionysius I of Syracuse
- Dionysius I Telmaharoyo
- Dionysius Lardner
- Dionysius of Halicarnassus
- Dionysius Periegetes
- Dionysus
- Dioon
- Diophantine equation
- Diopside
- Diorite
- Diospyros
- Diosso
- Dīpavaṃsa
- Diphenhydramine
- Diphilus
- Diphosphane
- Diphtheria
- Diphylleia cymosa
- Diphyllidea
- Diplacus aurantiacus
- Diplocaulus
- Diplodocus
- Diplogasterida
- Diplograptus
- Diploma
- Diplomacy
- Diplomat
- Diplomatic bag
- Diplomatic cable
- Diplomatic immunity
- Diplomatic mission
- Diplomatic rank
- Diplomatics
- Diplomonad
- Diplostraca
- Diplovertebron
- Diplura
- Dipoenus and Scyllis
- Dipole repeller
- Dipole
- Dipper
- Diprotodon
- Diprotodontia
- Diprotodontidae
- Dipsas
- Dipterus
- Dirac delta function
- Dirac equation
- Dirck Coornhert
- Dire Dawa
- Dire wolf
- Direct Access File System
- Direct coupling
- Direct current
- Direct democracy
- Direct examination
- Direct process
- Direct selling
- Direct3D
- Directed graph
- Directional derivative
- Directional drilling
- Director's cut
- Directory (computing)
- DirectX
- Dirge
- Dirichlet character
- Dirichlet problem
- Dirichlet series
- Dirichlet's theorem on arithmetic progressions
- Dirk Rafaelsz Camphuysen
- Dirt road
- Dirty bomb
- Dirty Harry
- Disability
- Disaccharide
- Disappointment
- Disarmament
- Disaster response
- Disc harrow
- Disc jockey
- Disc tumbler lock
- Discharge (hydrology)
- Discharging arch
- Discipline and Punish
- Disco
- Discobolus
- Discord
- Discourse on the Method
- Discourse
- Discourses of Epictetus
- Discovery (Daft Punk album)
- Discovery (law)
- Discovery Channel
- Discovery of cosmic microwave background radiation
- Discovery of the neutron
- Discrete logarithm
- Discrete manufacturing
- Discrete mathematics
- Discrete uniform distribution
- Discretionary trust
- Discrimination against atheists
- Discrimination based on skin color
- Discrimination
- Discus throw
- Discussion group
- Discworld
- Disease ecology
- Disease vector
- Disease
- Disfranchisement after the Reconstruction era
- Disgust
- Dishwasher
- Disinfectant
- Disk compression
- Disk formatting
- Disk image
- Disk Manager
- Disk mirroring
- Disk pack
- Disk partitioning
- Disk storage
- Diskcopy
- Disko Island
- Dislocation
- Disney Channel
- Disney comics
- Disney Renaissance
- Disodium citrate
- Disodium helide
- Disorderly house
- Dispensary
- Dispersion (chemistry)
- Dispersion (optics)
- Dispersion (water waves)
- Dispersion relation
- Dispersion-shifted fiber
- Displacement (geometry)
- Displacement activity
- Displacement current
- Display board
- Display Data Channel
- Display device
- Display typeface
- DisplayPort
- Disproportionation
- Dispute resolution
- Dissection
- Dissimilation
- Dissociation (chemistry)
- Dissociation constant
- Dissolution of Czechoslovakia
- Dissolution of the Soviet Union
- Dissolved load
- Distaff
- Distance education
- Distance measure
- Distance measuring equipment
- Distance-vector routing protocol
- Distance
- Distancing effect
- Distillation
- Distortion (optics)
- Distributed computing
- Distributed data processing
- Distributed generation
- Distributed object
- Distributed-feedback laser
- Distribution function (physics)
- Distributive property
- Distributive shock
- District
- Districts of Israel
- Districts of Suriname
- Distrust
- Distyle
- Dithyramb
- Diuris
- Divan-i Shams-i Tabrizi
- Divergence theorem
- Divergence
- Divergent boundary
- Divergent series
- Divergent synthesis
- Divide-and-conquer algorithm
- Dividend
- Divination
- Divine Comedy
- Divine command theory
- Diving bell spider
- Diving bell
- Diving duck
- Divinity
- Divisibility rule
- Division (mathematics)
- Division by zero
- Division of labour
- Division of the Mongol Empire
- Division sign
- Divisions of Bangladesh
- Divisor
- DivX
- Diwali
- Dixie (song)
- Dixie
- Dixieland
- Dixon Denham
- Diyar Al Muharraq
- Diyarbakır
- Dizziness
- Djelfa
- Djembe
- Djerba
- DJI
- Djibouti (city)
- Djibouti
- Djougou
- Dmanisi hominins
- Dmitri Mendeleev
- Dmitry Merezhkovsky
- Dmitry Mikhailovich Golitsyn the Elder
- DNA computing
- DNA ligase
- DNA microarray
- DNA polymerase
- DNA profiling
- DNA repair
- DNA replication
- DNA sequencing
- DNA
- Dnieper
- Dnipro
- Dnipropetrovsk Oblast
- Do not go gentle into that good night
- Do the Right Thing
- Dobbs Ferry, New York
- Dobell
- Döbeln
- Dobermann
- Dobrée
- Dobrich
- Dobruja
- Dobšiná
- Dobson unit
- Dobsonian telescope
- Doc (computing)
- Doccia porcelain
- Docetism
- Dock warrant
- Dock
- Docodon
- Docodonta
- Doctor Doom
- Doctor Faustus (novel)
- Doctor Faustus (play)
- Doctor of Philosophy
- Doctor of the Church
- Doctor Who
- Doctor Zhivago (novel)
- Doctorate
- Doctors' Commons
- Doctrinaires
- Doctrine of signatures
- Doctrine of the Mean
- Doctrine
- Document collaboration
- Document file format
- Document imaging
- Document management system
- Document processing
- Documentary film
- Dodai
- Dodanim
- Doddabetta
- Dodecahedron
- Dodecanese
- Dodecanol
- Dodo
- Dodoma
- Dodwell
- Doedicurus
- Dog days
- Dog flea
- Dog food
- Dog show
- Dog toy
- Dog-tooth
- Dog
- Dogali
- Doge of Venice
- Doge's Palace
- Dogger Bank
- Doggerland
- Dogmatic theology
- Dogon people
- Dogra dynasty
- Dogras
- Dogs Playing Poker
- Doha
- Dolben
- Dolby
- Dolch
- Dolgellau
- Dolhain
- Dolling
- Dollinger
- Dolly (sheep)
- Dolly Parton
- Dolman
- Dolomedes
- Dolomite (mineral)
- Dolomite (rock)
- Dolomites
- Dolon Nor
- Dolores Ibárruri
- Dolphin
- Domain (biology)
- Domain drop catching
- Domain name registrar
- Domain Name System
- Domain of a function
- Domain registration
- Domain theory
- Domain-specific language
- Dombes
- Dome of the Rock
- Dome
- Domenichino
- Domenico Alberto Azuni
- Domenico Alfani
- Domenico Beccafumi
- Domenico Campagnola
- Domenico Cirillo
- Domenico Comparetti
- Domenico Fetti
- Domenico Fontana
- Domenico Ghirlandaio
- Domenico Montagnana
- Domesday Book
- Domestic canary
- Domestic goose
- Domestic long-haired cat
- Domestic pigeon
- Domestic short-haired cat
- Domestic tragedy
- Domestic turkey
- Domestic violence
- Domestic worker
- Domesticated hedgehog
- Domesticated quail
- Domestication of the horse
- Domestication
- Dominance (genetics)
- Dominate
- Domingo Martínez de Irala
- Domingo Ortega
- Domingos Sequeira
- Dominic Barberi
- Dominic Corrigan
- Dominica
- Dominical letter
- Dominican Civil War
- Dominican Order
- Dominican Republic
- Dominicus Gundissalinus
- Dominikus Böhm
- Dominion of New England
- Dominique Anel
- Dominique Bouhours
- Dominique de Gourgues
- Dominique Joseph Garat
- Dominique Pire
- Dominique Rolin
- Dominique Vandamme
- Dominique, comte de Cassini
- Dominis
- Dominus (title)
- Domitius Afer
- Domitius Marsus
- Domrémy-la-Pucelle
- Domus de Maria
- Don (river)
- Don Benito
- Don Bragg
- Don Budge
- Don Giovanni
- Don Host Oblast
- Don Juan (poem)
- Don Juan Manuel
- Don Juan
- Don Quixote
- Donagh MacDonagh
- Donald Cameron of Lochiel
- Donald Currie
- Donald Davidson (philosopher)
- Donald Duck
- Donald F. Jones
- Donald Grant Mitchell
- Donald Judd
- Donald MacLeary
- Donald Ogden Stewart
- Donald Richberg
- Donald Smith, 1st Baron Strathcona and Mount Royal
- Donald Stokes, Baron Stokes
- Donald Trump
- Donatário
- Donati
- Donatia
- Donatism
- Donato Acciaioli
- Donato Giannotti
- Donauwörth
- Dondra
- Donetsk Oblast
- Donetsk People's Republic
- Donetsk
- Dong River (China)
- Dong Son culture
- Dongcheng District, Beijing
- Dongguan
- Donghak Peasant Revolution
- Donghak
- Donglin movement
- Dongting Lake
- Dongying
- Dongzhi (solar term)
- Donkey
- Dönmeh
- Donna de Varona
- Donoghue v Stevenson
- Donoughmore Commission
- Doomsday Clock
- Doonesbury
- Door
- Doordarshan
- Dopamine
- Doppler effect
- Dora the Explorer
- Dorado
- Doraemon
- Doria-Pamphili-Landi
- Doris Day
- Dorman Bridgman Eaton
- Dormancy
- Dormouse
- Dornburg
- Dorothe Engelbretsdatter
- Dorothea Dix
- Dorothea Jordan
- Dorothy Hodgkin
- Dorset
- Dorsiventral
- Dortmund–Ems Canal
- Dortmund
- Dorudon
- DOS
- DOS/360 and successors
- Dosage form
- Dositheus Magister
- Dossal
- Dost Mohammad Khan
- Dot matrix printing
- Dot matrix
- Dot product
- Dots per inch
- Dotted note
- Douala
- Douarnenez
- Douay–Rheims Bible
- Double bass
- Double bond
- Double counting (proof technique)
- Double diffusive convection
- Double fisherman's knot
- Double Indemnity
- Double Ninth Festival
- Double pendulum
- Double star
- Double Third Festival
- Double-decker bus
- Double-entry bookkeeping
- Double-slit experiment
- Doubt
- Douglas DC-3
- Douglas DC-6
- Douglas DC-8
- Douglas fir
- Douglas William Jerrold
- Doukas
- Doullens
- Douro
- Douville
- Dover, Delaware
- Dover, Ohio
- Dover
- Dow Inc.
- Dowdeswell
- Dower
- Dowitcher
- Dowlas
- Down quark
- Down syndrome
- Downhill creep
- Downland
- Downton Abbey
- Downtown no Gaki no Tsukai ya Arahende!!
- Downtown
- Dowsing
- Doxycycline
- Dozen
- DPT vaccine
- DR-DOS
- Dr. Bonham's Case
- Dr. Strangelove
- Dr. Watson
- Drabsha
- Dracaena (plant)
- Draco (constellation)
- Draco (lizard)
- Draconian constitution
- Dracontius
- Dracula
- Dracunculiasis
- Drafted masonry
- Drafting machine
- Drag (physics)
- Drag and drop
- Drag king
- Drag queen
- Drag show
- Drăgășani
- Dragnet (franchise)
- Dragomirov
- Dragon Ball Z
- Dragon Ball
- Dragon Boat Festival
- Dragon's blood
- Dragon's mouth
- Dragon
- Dragonet
- Dragonetti
- Dragonfly
- Drainage basin
- Drainage
- Drake & Josh
- Drake equation
- Drake Passage
- Drakensberg
- Dram (unit)
- Drama (film and television)
- Drama
- Dramatic structure
- Dramaturgy
- Dravidian languages
- Dravidian peoples
- Drawbridge
- Drawing (manufacturing)
- Drawing board
- Drawing Hands
- Drawing
- Drawsko Pomorskie
- Dreadnought
- Dream of the Red Chamber
- Dream yoga
- Dream
- Dred Scott v. Sandford
- Dredging
- DREF friction spinning
- Drelincourt
- Drenthe
- Drepanosaur
- Dresden
- Dreyfus affair
- Dreyse needle gun
- Drilling
- Drink
- Drinking water
- Drinking
- Driving under the influence
- Driving
- Drizzle
- Drobeta-Turnu Severin
- Droit
- Dromaeosauridae
- Dromedary
- Dromiidae
- Dromore, County Down
- Dromornis
- Drongo
- Droop speed control
- Drop (unit)
- Dropline
- Dropwort
- Drosera
- Drosophila melanogaster
- Drouet
- Drought tolerance
- Drought
- Drowning Girl
- Drowning
- Drug cartel
- Drug class
- Drug delivery
- Drug interaction
- Drug overdose
- Drug test
- Drug
- Druidry (modern)
- Drukpa Kagyu
- Drum and bass
- Drum machine
- Drum
- Druze
- Drwęca
- Dry dock
- Dry lake
- Dry measure
- Dry rot
- Dry season
- Dryad
- Drying
- Dryland farming
- Drylands
- Dryopithecus
- Drywall
- Drywasher
- DSL modem
- Dsungaripterus
- Dua
- Dual-mode mobile
- Duality (optimization)
- Duality (order theory)
- Dubai International Airport
- Dubai Metro
- Dubai
- Dublin
- Dubliners
- Dubner
- Dubnium
- Dubrovnik
- Dubstep
- Duchesne
- Duchess Anna Amalia of Brunswick-Wolfenbüttel
- Duchy of Bar
- Duchy of Brittany
- Duchy of Burgundy
- Duchy of Ferrara
- Duchy of Mantua
- Duchy of Milan
- Duchy of Savoy
- Duchy of Spoleto
- Duchy of Urbino
- Duck Soup (1933 film)
- Duck
- DuckTales
- Ductility (Earth science)
- Ductility
- Dudley Buck
- Dudley Costello
- Dudley Fenner
- Dudley North, 3rd Baron North
- Dudley North, 4th Baron North
- Dudley Ryder, 1st Earl of Harrowby
- Dudley Ryder, 2nd Earl of Harrowby
- Dudo of Saint-Quentin
- Dudweiler
- Due process
- Duel
- Duff Green
- Duff-Gordon baronets
- Dugald Stewart
- Dugong
- Duḥkha
- Duhok
- Duiker
- Duino Elegies
- Duisburg
- Duk-Duk
- Duke of Aarschot
- Duke of Albany
- Duke of Atholl
- Duke of Beaufort
- Duke of Bourbon
- Duke of Brissac
- Duke of Buccleuch
- Duke of Chandos
- Duke of Clarence
- Duke of Cumberland
- Duke of Devonshire
- Duke of Exeter's daughter
- Duke of Grafton
- Duke of Hamilton
- Duke of Kent
- Duke of Kingston-upon-Hull
- Duke of Manchester
- Duke of Marlborough (title)
- Duke of Mercœur
- Duke of Montrose
- Duke of Nemours
- Duke of Norfolk
- Duke of Northumberland
- Duke of Orléans
- Duke of Richmond
- Duke of Rohan
- Duke of Roxburghe
- Duke of Rutland
- Duke of Westminster
- Duke of York
- Duke of Zhou
- Duke University
- Duke
- Dulcinea del Toboso
- Duleep Singh
- Dülken
- Duluth, Minnesota
- Dumanjug
- Dumbbell Nebula
- Dumbwaiter
- Dumesnil
- Dumfriesshire
- Dumortierite
- Dump truck
- Dumuzi-abzu
- Dumuzid
- Dún Laoghaire–Rathdown
- Dunash
- Duncan I of Scotland
- Dunce
- Dunderland Valley
- Dune (novel)
- Dune buggy
- Dune of Pilat
- Dune
- Dunedin
- Dung beetle
- Dungarpur
- Dunkeld
- Dunkleosteus
- Dunnart
- Dunrobin Castle
- Dunstaffnage Castle
- Duodecimal
- Duport
- Dupuis
- Duque de Caxias, Rio de Janeiro
- Dur-Sharrukin
- Dural venous sinuses
- Duralumin
- Durance
- Durand Line
- Durango City
- Durango
- Durant Regional Airport–Eaker Field
- Durão
- Durban
- Düren
- Dürer graph
- Durfort family
- Durga
- Durgapur
- Durham University
- Durham, North Carolina
- Durian
- Duris of Samos
- Durneva Island
- Durrani Empire
- Durrani
- Durrat Al Bahrain
- Durrës
- Durum
- Dushanbe
- Dusk
- Düsseldorf-Gerresheim
- Düsseldorf-Kaiserswerth
- Düsseldorf
- Dust Bowl
- Dust devil
- Dust storm
- Dust
- Dutch Cape Colony
- Dutch Ceylon
- Dutch colonization of the Americas
- Dutch East India Company
- Dutch East Indies
- Dutch Empire
- Dutch Ethical Policy
- Dutch Golden Age painting
- Dutch Golden Age
- Dutch language
- Dutch-language literature
- Dutch–Portuguese War
- Dutens
- Duttaphrynus melanostictus
- Duty
- Duumviri
- Duval
- Duyun
- Dvaravati
- DVD
- Dvorak technique
- Dvůr Králové nad Labem
- Dwarf (folklore)
- Dwarf crocodile
- Dwarf elephant
- Dwarf elliptical galaxy
- Dwarf galaxy
- Dwarf planet
- Dwarf rabbit
- Dwarfing
- Dwarka
- Dyal
- Dye laser
- Dye
- Dyeing
- Dymoke
- Dynamic demand (electric power)
- Dynamic programming
- Dynamic random-access memory
- Dynamic simulation
- Dynamic web page
- Dynamical system
- Dynamical systems theory
- Dynamics (mechanics)
- Dynamics (music)
- Dynamite
- Dynasty (1981 TV series)
- Dyne
- Dypsis lutescens
- Dysentery
- Dysgenics
- Dysgeusia
- Dyslexia
- Dysnomia (moon)
- Dysprosium
- Dysteleology
- Dysthymia
- Dytiscus
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- Enguerrand de Marigny
- Enguerrand de Monstrelet
- Enguri Dam
- Engyon
- Enhancer (genetics)
- ENIAC
- Enigma machine
- Enigma Variations
- Enki
- Enkidu
- Enlightenment in Buddhism
- Enlil
- Enmerkar
- Ennedi Plateau
- Ennstal Alps
- Enol
- Enola Gay
- Enomoto Takeaki
- Enragés
- Enrico Caterino Davila
- Enrico Cialdini
- Enrico Cosenz
- Enrique de Villena
- Enrique Fernández Arbós
- Enrique Flórez
- Enrique O'Donnell, Conde de La Bisbal
- Ensis
- Enstatite
- Entablature
- Entelodont
- Enter the Dragon
- Enterprise portal
- Entertainment journalism
- Entertainment law
- Entertainment Tonight
- Entertainment Weekly
- Entertainment
- Enthalpy of vaporization
- Enthalpy
- Entire function
- Entity
- Entomological warfare
- Entomology
- Entomostraca
- Entrance of the Gladiators
- Entrapment
- Entre Ríos Province
- Entre-Douro-e-Minho Province
- Entrepôt
- Entrepreneurship
- Entropy (classical thermodynamics)
- Entropy (information theory)
- Entropy (statistical thermodynamics)
- Entropy of activation
- Entropy of mixing
- Entropy
- Entry point
- Entscheidungsproblem
- Enugu State
- Enugu
- Enūma Eliš
- Enumerative combinatorics
- Envelope
- Environmental art
- Environmental biotechnology
- Environmental chemistry
- Environmental communication
- Environmental conflict
- Environmental crime
- Environmental degradation
- Environmental determinism
- Environmental engineering
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- Environmental history
- Environmental humanities
- Environmental impact of agriculture
- Environmental issues
- Environmental justice
- Environmental law
- Environmental philosophy
- Environmental policy
- Environmental protection
- Environmental remediation
- Environmental resource management
- Environmental science
- Environmental studies
- Environmentalism
- Envy
- Enzio
- Enzyme unit
- Enzyme
- Eocene
- Eocrinoidea
- Eohippus
- Eomaia
- Eoraptor
- Eosinophil
- Eparchy
- Épée
- Epeirogenic movement
- Epenthesis
- Eperjes
- Épernay
- Épernon
- Ephebos
- Ephedrine
- Ephemeris
- Ephesus
- Ephorus
- Ephron
- Epic (genre)
- Epic film
- Epic of Gilgamesh
- Epic of King Gesar
- Epic of Manas
- Epic of Sundiata
- Epic poetry
- Epicenter
- Epicharmus of Kos
- Epicyclic gearing
- Epidemic
- Epidemiology of HIV/AIDS
- Epidemiology
- Epidermis (botany)
- Epidermis
- Epidote
- Epigenetics
- Epigenome
- Epigenomics
- Epigonion
- Epigraphy
- Epilepsy
- Epilogue
- Epimenides paradox
- Epinephrine (medication)
- Epiphany (holiday)
- Episode
- Epistemology
- Epistle of James
- Epistle of Jude
- Epistle to Philemon
- Epistle to the Colossians
- Epistle to the Ephesians
- Epistle to the Galatians
- Epistle to the Hebrews
- Epistle to the Philippians
- Epistle to the Romans
- Epistle to Titus
- Epistulae Morales ad Lucilium
- Epistylis
- Epitaxy
- Epithalamium
- Epithelium
- Epoch (astronomy)
- Epoch (computing)
- Epoch
- Epode
- Epoxide
- Epoxy
- EPROM
- Epsilon Canis Majoris
- Epsilon Eridani
- Epson
- Equal pay for equal work
- Equality (mathematics)
- Equality before the law
- Equation of state
- Equation of the center
- Equation solving
- Equation
- Equations for a falling body
- Equations of motion
- Equator
- Equatorial bulge
- Equatorial coordinate system
- Equatorial Guinea
- Equatorial mount
- Equerry
- Equestrian statue of Gattamelata
- Equestrianism
- Equidae
- Equilateral triangle
- Equilibrium constant
- Equilibrium thermodynamics
- Equinox (celestial coordinates)
- Equinox
- Equipartition theorem
- Equipotential
- Equisetum
- Equity (finance)
- Equity (law)
- Equivalence principle
- Equivalence relation
- Equuleus
- ER (TV series)
- Era
- Eraser
- Erasmus Alberus
- Erasmus University Rotterdam
- Erastus Dow Palmer
- Erastus Fairbanks
- Erastus
- Erba-Odescalchi
- Erbil
- Erbium
- Erdenet
- Erebidae
- Erectile dysfunction
- Ereshkigal
- Eretria
- Eretrian school
- Erfurt Union
- Erfurt
- Erg
- Ergot
- Eric XIV of Sweden
- Ericaceae
- Erice
- Ericsson cycle
- Ericsson
- Eridanus (constellation)
- Eridu
- Erie Canal
- Erie, Pennsylvania
- Erik Dahlbergh
- Erik Johan Stagnelius
- Erik Pontoppidan
- Erinaceidae
- Erinna
- Eriophorum
- Eriophyllum lanatum
- Eris (dwarf planet)
- Eritrea
- Eritrean War of Independence
- Erlang Shen
- Erlik
- Erlking
- Erlkönig
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- Ernest Charles Jones
- Ernest Courtot de Cissey
- Ernest Guiraud
- Ernest Hart (medical journalist)
- Ernest Hello
- Ernest Jones
- Ernest Lavisse
- Ernest Legouvé
- Ernest Meissonier
- Ernest Renan
- Ernest Waterlow
- Ernest-Aimé Feydeau
- Ernest, Elector of Saxony
- Ernst & Young
- Ernst Chladni
- Ernst Curtius
- Ernst Dümmler
- Ernst Engel
- Ernst Friedrich August Rietschel
- Ernst Friedrich Poppo
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- Ernst Gideon von Laudon
- Ernst Haeckel
- Ernst Heinrich Karl von Dechen
- Ernst Johann von Biron
- Ernst Laas
- Ernst Ludwig Gerber
- Ernst Moritz Ludwig Ettmüller
- Ernst Philipp Karl Lange
- Ernst Raupach
- Ernst Richter
- Ernst von Mansfeld
- Ernst von Wildenbruch
- Ernst Wilhelm Hengstenberg
- Ernst, Baron von Feuchtersleben
- Erode
- Eros
- Erosion
- Erotic dance
- Erotic literature
- Erroll
- Error correction code
- Error detection and correction
- Error function
- Error message
- Eruca vesicaria
- Eruption of Mount Vesuvius in 79 AD
- Erysimum
- Erythritol
- Erythromycin
- Erythronium
- Erythroxylum
- Erzincan
- Erzurum
- Esaias Boursse
- Esaias Tegnér
- Esarhaddon
- Esau
- Esbjerg
- Escagraph
- Escalation clause
- Escanaba, Michigan
- Escape velocity
- Escapement
- Escapology
- Escarpment
- Eschatology
- Escherichia coli
- Escovedo
- Esker
- Eskimo–Aleut languages
- Eskişehir
- Eslamshahr
- Esna
- Esociformes
- Esophagus
- Esotropia
- Espalier
- Esperanto
- Esperanza (Philippine TV series)
- Espionage
- Espírito Santo
- Espiritu Santo
- ESPN
- Espoo
- Esprit Fléchier
- Esquire (magazine)
- Esquire
- Essaouira
- Essay
- Essays (Montaigne)
- Essen
- Essenes
- Essential amino acid
- Essentially contested concept
- Essex
- Establishment of a port
- Estahban
- Estate agent
- Estate in land
- Estates General (France)
- Estates General of 1789
- Estates of the realm
- Esteban Manuel de Villegas
- Esteban Martín
- Ester
- Esterházy
- Estes Kefauver
- Esther
- Estienne
- Estimation
- Estonia
- Estonian language
- Estoppel
- Estovers
- Estreat
- Estremoz
- Estrildidae
- Estrogen
- Estuary
- Eswatini
- Eta Carinae
- Étagère
- Etah
- Étampes
- Etching
- Etchmiadzin Cathedral
- Eternal Sunshine of the Spotless Mind
- Eternity
- ETH Zurich
- Ethan Frome
- Ethane
- Ethanol
- EThekwini Metropolitan Municipality
- Ether
- Ethernet hub
- Ethernet
- Ethical egoism
- Ethics (Spinoza book)
- Ethics
- Ethiopia
- Ethiopian chant
- Ethiopian Civil War
- Ethiopian Empire
- Ethiopian Highlands
- Ethiopian Orthodox Tewahedo Church
- Ethiopian wolf
- Ethnarch
- Ethnic cleansing
- Ethnic conflict
- Ethnic enclave
- Ethnic group
- Ethnic media
- Ethnic minorities in China
- Ethnic religion
- Ethnocentrism
- Ethnography
- Ethnology
- Ethnomusicology
- Ethology
- Ethyl acetate
- Ethylene glycol
- Ethylene
- Ethylenediamine
- Ethylenediaminetetraacetic acid
- Étienne Arnal
- Étienne Bonnot de Condillac
- Étienne Charles de Loménie de Brienne
- Étienne Chauvin
- Étienne Clavière
- Étienne Constantin de Gerlache
- Étienne de Flacourt
- Étienne de Poncher
- Étienne Dolet
- Étienne Dumont
- Étienne François Geoffroy
- Étienne François, duc de Choiseul
- Étienne Geoffroy Saint-Hilaire
- Étienne Jodelle
- Étienne Joseph Louis Garnier-Pagès
- Étienne Macdonald
- Étienne Marc Quatremère
- Étienne Marcel
- Étienne Maurice Falconet
- Étienne Maurice Gérard
- Étienne Méhul
- Étienne Mélingue
- Étienne Pasquier
- Étienne Pivert de Senancour
- Étienne Vacherot
- Étienne-Denis Pasquier
- Étienne
- Etiquette
- Etosha pan
- ETOX
- Etox
- Étretat
- Etruscan art
- Etruscan civilization
- Ettenheim
- Ettlingen
- Étude
- Etymology
- Eublepharis
- Euboea
- Eubulides
- Eucalyptol
- Eucalyptus
- Eucestoda
- Eucharist
- Euclid's Elements
- Euclid's theorem
- Euclid
- Euclidean algorithm
- Euclidean geometry
- Euclidean space
- Euclidean vector
- Eudicots
- Eugen Dühring
- Eugen Gura
- Eugen Richter
- Eugen von Böhm-Bawerk
- Eugène André Oudiné
- Eugene Aram
- Eugène Auguste Ernest Havet
- Eugène Boudin
- Eugène Brieux
- Eugène Burnouf
- Eugène Delacroix
- Eugène Fromentin
- Eugène Joseph Verboeckhoven
- Eugène Manuel
- Eugène Marin Labiche
- Eugene O'Curry
- Eugene Onegin
- Eugène Renevier
- Eugène Rouher
- Eugène Scribe
- Eugène Spuller
- Eugène Sue
- Eugène Viollet-le-Duc
- Eugene, Oregon
- Eugenics
- Eugénie Archipelago
- Eugénie Grandet
- Eugenol
- Euglenid
- Euglenozoa
- Euharamiyida
- Euhemerism
- Eukaryote
- Euler characteristic
- Euler equations (fluid dynamics)
- Euler method
- Euler–Lagrange equation
- Euler's constant
- Euler's formula
- Euler's identity
- Euler's three-body problem
- Euler's totient function
- Eulerian path
- Eumenes
- Eumenius
- Eunapius
- Eunomius of Cyzicus
- Eunuch flute
- Eunuch
- Euodia and Syntyche
- Euoplocephalus
- Eupalinos
- Euparkeria
- Eupatridae
- Euphemism
- Euphemites
- Euphonium
- Euphorbiaceae
- Euphorbium
- Euphoria
- Euphorion of Chalcis
- Euphranor
- Euphrates
- Euphronios
- Eupione
- Eupolis
- Eupompus
- Eurasia
- Eurasian brown bear
- Eurasian carp
- Eurasian collared dove
- Eurasian eagle-owl
- Eurasian Economic Community
- Eurasian Economic Union
- Eurasian magpie
- Eurasian Plate
- Eurasian Steppe
- Eureka Rebellion
- Eureka Seven
- Euro
- Euroclydon
- Eurofighter Typhoon
- Euromaidan
- Euronews
- Europa (consort of Zeus)
- Europa (moon)
- Europasaurus
- Europe
- European Arrest Warrant
- European Atomic Energy Community
- European badger
- European Bank for Reconstruction and Development
- European bass
- European bison
- European Broadcasting Union
- European bullhead
- European Coal and Steel Community
- European colonization of the Americas
- European conger
- European Convention on Human Rights
- European Court of Justice
- European dark bee
- European debt crisis
- European dragon
- European Economic Community
- European eel
- European exploration of Africa
- European fallow deer
- European hare
- European honey buzzard
- European integration
- European Investment Bank
- European land exploration of Australia
- European long-distance paths
- European mink
- European Parliament
- European Physical Journal
- European polecat
- European rabbit
- European robin
- European science in the Middle Ages
- European shag
- European Southern Observatory
- European Space Agency
- European spadefoot toad
- European sprat
- European Union legislative procedure
- European Union
- European wars of religion
- Europium
- Eurostar
- EuroVelo
- Eurovision Song Contest
- Euryarchaeota
- Eurypterid
- Eurypterus
- Eurytherm
- Eusèbe Renaudot
- Eusebius Amort
- Eusebius of Emesa
- Euskirchen
- Eusociality
- Eustace Clare Grenville Murray
- Eustace II, Count of Boulogne
- Eustace IV, Count of Boulogne
- Eustache Deschamps
- Eustache Le Sueur
- Eustathios Makrembolites
- Eustathius of Antioch
- Eusthenopteron
- Eustigmatophyte
- Eutawville, South Carolina
- Eutectic system
- Euthanasia
- Eutheria
- Eutriconodonta
- Eutrophication
- Eutropius (historian)
- Eutyches
- Eutychides
- Evan Herber Evans
- Evanescent field
- Evangelical Association
- Evangelical Church Conference
- Evangelical Synod of North America
- Evangelical Union (Scotland)
- Evangelical United Brethren Church
- Evangelicalism
- Evangelista Torricelli
- Evanson
- Evaporation
- Evaporative cooler
- Evaporite
- Évariste de Parny
- Évariste Régis Huc
- Eve
- Evection
- Eveleth, Minnesota
- Evelyn Denison, 1st Viscount Ossington
- Evelyn Wood (British Army officer)
- Even and odd functions
- Even-toed ungulate
- Evening
- Evenks
- Event (probability theory)
- Event horizon
- Everdingen
- Everglades National Park
- Everglades
- Everhardus Johannes Potgieter
- Evidence (law)
- Evil
- Evita (musical)
- Evolution of bacteria
- Evolution of birds
- Evolution of brachiopods
- Evolution of cetaceans
- Evolution of fish
- Evolution of fungi
- Evolution of insects
- Evolution of mammals
- Evolution of molluscs
- Evolution of reptiles
- Evolution of spiders
- Evolution of tetrapods
- Evolution of the horse
- Evolution-Data Optimized
- Evolution
- Evolutionary biology
- Evolutionary developmental biology
- Evolutionary history of plants
- Evolutionary linguistics
- Evolutionary origin of religions
- Evolutionary psychology
- Évora
- Évreux
- Ewald Christian von Kleist
- Ewald Friedrich von Hertzberg
- Ewart
- Ewe language
- Ewha Womans University
- Ex Libris (bookplate)
- Ex post facto law
- Exabit
- Exam
- Exbibit
- Excalibur
- Excavata
- Excavator
- Excelsior Diamond
- Exception handling
- Exchange rate
- Excise
- Excited state
- Exclamation mark
- Excommunication
- Excretion
- Executable
- Execution of Charles I
- Executioner
- Executive (government)
- Executive agreement
- Exegesis
- Exequatur
- Exercise
- Exhibit design
- Exif
- Exile on Main St.
- Exile
- Exili
- Existence of God
- Existence
- Existential quantification
- Existential risk from artificial general intelligence
- Existentialism
- Exit interview
- Exmoor
- Exocytosis
- Exomoon
- Exon
- Exoplanet
- Exoskeleton
- Exosphere
- Exothermic process
- Exothermic reaction
- Exotic atom
- Exotic matter
- Exotic Shorthair
- Exotic star
- Expanded memory
- Expansion card
- Expansion of the universe
- Expansion path
- Expansionism
- Expatriate
- Expectation value (quantum mechanics)
- Expectation–maximization algorithm
- Expected value
- Experience curve effects
- Experience
- Experiment
- Experimental aircraft
- Experimental film
- Experimental music
- Experimental physics
- Exploration of Mars
- Exploration
- Explosive
- Explosively formed penetrator
- Exponential distribution
- Exponential function
- Exponential growth
- Exponential integral
- Exponentiation
- Exposure (photography)
- ExpressCard
- Expression (mathematics)
- Expression vector
- Expressionism
- Expressionist architecture
- Expressionist dance
- Expressionist music
- Expulsion of the Chagossians
- Ext4
- Extended breastfeeding
- Extended Euclidean algorithm
- Extended periodic table
- Extended real number line
- Extension (music)
- Extensive farming
- Extensive reading
- Extensive-form game
- Exterior algebra
- External memory interface
- Externsteine
- Extinction (astronomy)
- Extinction event
- Extinction Rebellion
- Extinction
- Extortion
- Extracellular fluid
- Extract, transform, load
- Extract
- Extraction (chemistry)
- Extractive metallurgy
- Extragalactic astronomy
- Extrametricality
- Extranuclear inheritance
- Extrapolation
- Extrasensory perception
- Extraterrestrial intelligence
- Extraterrestrial life
- Extraterrestrial vortex
- Extraterritoriality
- Extratropical cyclone
- Extraversion and introversion
- Extremadura
- Extreme Championship Wrestling
- Extreme poverty
- Extreme value theorem
- Extreme weather
- Extremely Large Telescope
- Extremophile
- Extrusion
- Extrusive rock
- ExxonMobil
- Eye (cyclone)
- Eye examination
- Eye
- Eyepiece
- Eyes of Dawn
- Eyre Coote (East India Company officer)
- Eyre Evans Crowe
- Ezekiel
- Ezra–Nehemiah
- Ezra
- Ezzelino III da Romano
- Ezzolied
- F region
- F-center
- F. C. Burnand
- F. J. A. Hort
- Fabaceae
- Faber–Jackson relation
- Fabergé egg
- Fabius Planciades Fulgentius
- Fable
- Fabre d'Églantine
- Fabre
- Fabric (geology)
- Fabry–Pérot interferometer
- Façade
- Face
- Facial expression
- Facial tissue
- Facies
- Facilitated diffusion
- Fact
- Factional violence in Libya (2011–2014)
- Factorial experiment
- Factorial
- Factors of production
- Factory Acts
- Factory
- Factual television
- Facultative bipedalism
- Faculty of Advocates
- Fad
- FADEC
- Fagus sylvatica
- Fahrenheit 451
- Fahrenheit
- Faial Island
- Faience
- Failaka Island
- Fair use
- Fairbanks, Alaska
- Fairchild Republic A-10 Thunderbolt II
- Fairuzabadi
- Fairy Tail
- Fairy tale
- Fairy
- Faisalabad
- Faith and rationality
- Faith healing
- Faith
- Faiyum Governorate
- Faiyum
- Fakaofo
- Fake fur
- Fakhr al-Din al-Razi
- Falcon
- Falconry
- Faldstool
- Falerii
- Falerone
- Faliscan language
- Falisci
- Falkes de Bréauté
- Falkland Islands wolf
- Falkland Islands
- Falklands War
- Fall armyworm
- Fall of Babylon
- Fall of Constantinople
- Fall of Kabul (2021)
- Fall of man
- Fall of Saigon
- Fall of Singapore
- Fall of the Republic of Venice
- Fall of the Western Roman Empire
- Fallacy
- Fallen angel
- Fallibilism
- Fallingwater
- Fallujah
- False Cape Horn
- False Dmitry II
- False Dmitry III
- False gharial
- False imprisonment
- False killer whale
- False Point
- False pretenses
- False prophet
- Falsifiability
- Falstaff (opera)
- Fălticeni
- Falun Gong
- Familia Caritatis
- Familialism
- Family (biology)
- Family farm
- Family Feud
- Family Group (Moore)
- Family Guy
- Family medicine
- Family Ties
- Family
- Famine
- Famous Funnies
- Fan vault
- Fan-Tan
- Fancy pigeon
- Fandom
- Fanfin
- Fangchenggang
- Fangyi
- Fanny Davenport
- Fanny Elssler
- Fanny Hill
- Fanny Lewald
- Fano
- Fantasia (music)
- Fantasia on a Theme by Thomas Tallis
- Fantasy fandom
- Fantasy
- FAO soil classification
- Far East
- Far side of the Moon
- Far-sightedness
- Farad
- Faraday cage
- Faraday effect
- Faraday's law of induction
- Faraj
- Farallon Plate
- Faraulep
- Fargo, North Dakota
- Faridabad
- Farinelli
- Farm
- Farmer
- Farmers' movement
- Farnaby
- Farnese Hercules
- Faro (banking game)
- Faroe Islands
- Faroese language
- Faror Island
- Farrant
- Farrer Herschell, 1st Baron Herschell
- Farrukhabad
- Fars province
- Fasa
- Fascine
- Fascism
- Fashion design
- Fashion journalism
- Fashion photography
- Fashion
- Fashoda Incident
- Fast Company
- Fast Fourier transform
- Fast radio burst
- FastCAD
- Fastener
- Fasti
- Fasting in Islam
- Fasting
- Fat
- Fata Morgana (mirage)
- Father Christmas
- Father Damien
- Father Knows Best
- Father's Day
- Fathers and Sons (novel)
- Fathom
- Fatigue (material)
- Fatimah
- Fatimid Caliphate
- Fatimid conquest of Egypt
- Fatimid dynasty
- Fatsia japonica
- Fattail scorpion
- Fatty acid
- Fatty alcohol
- Fatwa
- Faubourg
- Fault (geology)
- Fault block
- Fault mechanics
- Fault tree analysis
- Fauna
- Fauresmith (industry)
- Faust
- Fausto Sozzini
- Favorinus
- Favre
- Favus
- Fawlty Towers
- Fax modem
- Fax
- Fayalite
- Fayetteville, North Carolina
- Fazogli
- Fear and Loathing in Las Vegas
- Fear and Trembling
- Fear
- Feasibility study
- Feasible region
- Feast of Corpus Christi
- Feast of the Ascension
- Feast of the Ass
- Feather
- Featherbedding
- Feathered dinosaur
- Febronianism
- February Revolution
- February
- Fecal–oral route
- Fechter
- Federal Bureau of Investigation
- Federal Capital Territory (Nigeria)
- Federal Communications Commission
- Federal District (Brazil)
- Federal district
- Federal Republic of Central America
- Federal Reserve
- Federalism
- Federated state
- Federated States of Micronesia
- Fédération Aéronautique Internationale
- Fédération Internationale de Motocyclisme
- Federation of Australia
- Federation of Bosnia and Herzegovina
- Federation of Independent Unions
- Federation
- Federative units of Brazil
- Federici
- Federico Barocci
- Federico Confalonieri
- Federico de Madrazo y Kuntz
- Federico Della Valle
- Federico Sclopis
- Federico Zuccari
- Federigo Giambelli
- FedEx Express
- Fee tail
- Feedback
- Feeler gauge
- Fehrbellin
- Feigenbaum constants
- Feith
- Fejér County
- Felanitx
- Feldspar
- Felice Cavallotti
- Felice Orsini
- Félicien David
- Félicité de La Mennais
- Felidae
- Félix Bracquemond
- Felix Dahn
- Félix Dupanloup
- Félix Faure
- Felix Karrer
- Felix Klein
- Félix María de Samaniego
- Felix Mendelssohn
- Felix Mottl
- Felix Neff
- Félix Pécaut
- Félix Pyat
- Félix Ravaisson-Mollien
- Felix the Cat
- Félix Tisserand
- Félix Ziem
- Fellah
- Felling, Tyne and Wear
- Felo de se
- Felony
- Felsted School
- Felsted
- Felt
- Feltre
- Female genital mutilation
- Female reproductive system
- Female
- Femerell
- Feminine hygiene
- Feminism
- Feminist art
- Feminist separatism
- Feminist theology
- Feminist theory
- Femme fatale
- Femtometre
- Femtosecond
- Femur
- Fen
- Fences (play)
- Fenestella
- Feng shui
- Fengman Dam
- Fengtai District
- Fengu people
- Fenian Brotherhood
- Fenian
- Fennec fox
- Fennel
- Fennoscandia
- Fenrir
- Fentanyl
- Fenugreek
- Fenwick Williams
- Feodor II of Russia
- Feodor III of Russia
- Feoffment
- Feral cat
- Feral horse
- Feral pigeon
- Ferdinand André Fouqué
- Ferdinand Berthoud
- Ferdinand Brunetière
- Ferdinand Christian Baur
- Ferdinand de Lesseps
- Ferdinand Fabre
- Ferdinand Gotthelf Hand
- Ferdinand Hérold
- Ferdinand Hiller
- Ferdinand Hitzig
- Ferdinand I of Bulgaria
- Ferdinand I of León
- Ferdinand I of Naples
- Ferdinand I of Portugal
- Ferdinand I of the Two Sicilies
- Ferdinand II of Naples
- Ferdinand II of the Two Sicilies
- Ferdinand IV of Castile
- Ferdinand Lassalle
- Ferdinand Magellan
- Ferdinand Raimund
- Ferdinand Sommer
- Ferdinand Vandeveer Hayden
- Ferdinand VII of Spain
- Ferdinand von Hochstetter
- Ferdinand von Mueller
- Ferdinand von Richthofen
- Ferdinand von Roemer
- Ferdinand von Schill
- Ferdinand Walsin Esterhazy
- Ferdinand Zirkel
- Ferdinand-Alphonse Hamelin
- Ferdinando Bartolommei
- Ferdinando Fairfax, 2nd Lord Fairfax of Cameron
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- Flight
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- Fold mountains
- Foldering
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- Foot
- Football chant
- Football hooliganism
- Football War
- Footballfish
- Footman
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- For He's a Jolly Good Fellow
- For Whom the Bell Tolls
- Forage
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- Forbach
- Forbes
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- Forbidden mechanism
- Force carrier
- Force field (physics)
- Force
- Forced displacement
- Forced labour
- Forchhammer
- Forcing (mathematics)
- Ford Motor Company
- Ford–Fulkerson algorithm
- Fordism
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- Forensic geophysics
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- Foreshock
- Foreskin
- Forest floor
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- Forest
- Forestry
- Forge
- Forgery
- Forgetful functor
- Forging
- Forgiveness
- Forklift
- Forlì
- Forlorn hope
- Formal fallacy
- Formal grammar
- Formal language
- Formal science
- Formal specification
- Formal verification
- Formaldehyde
- Formation and evolution of the Solar System
- Formatted text
- Formic acid
- Formica rufa
- Formosa Province
- Formosan subterranean termite
- Formula
- Fornax Cluster
- Fornax
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- Fort Lauderdale, Florida
- Fort Peck Dam
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- Fortified tower
- Fortition
- Fortnight
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- Fortunat Alojzy Gonzaga Żółkowski
- Fortunatus
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- Fortuné du Boisgobey
- Forum Appii
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- Forward contract
- Foscari
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- Fossa (animal)
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- Fossano
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- Fossil fuel
- Fossil
- Fossombrone
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- Foucher
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- Foundations of Geopolitics
- Foundations of mathematics
- Founder effect
- Foundling hospital
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- Four Books and Five Classics
- Four color theorem
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- Four Horsemen of the Apocalypse
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- Four Tank-Men and a Dog
- Four-bar linkage
- Four-dimensional space
- Four-eyed fish
- Four-momentum
- Four-stroke engine
- Four-vector
- Fourchambault
- Fourier analysis
- Fourier optics
- Fourier series
- Fourier transform
- Fourier-transform infrared spectroscopy
- Fourth Crusade
- Fourth Fitna
- Fourth generation of video game consoles
- Fourth-wave feminism
- Fouta Djallon
- Fowl
- Fox Broadcasting Company
- Fox Maule-Ramsay, 11th Earl of Dalhousie
- Fox News
- Fox
- Foxconn
- Foxtrot
- Fra Angelico
- Fra Bartolomeo
- Fra Diamante
- Fra Diavolo
- Fractal
- Fraction
- Fractional crystallization (chemistry)
- Fractional distillation
- Fractional factorial design
- Fractional freezing
- Fractionating column
- Fracture (geology)
- Fracture toughness
- Fractus cloud
- Frailty syndrome
- Fraktur
- Frame of reference
- Framjee Nasarwanjee Patel
- Francavilla Fontana
- France in the Middle Ages
- France
- Frances Abington
- Frances Burney
- Frances Hodgson Burnett
- Frances Stewart, Duchess of Richmond
- Franceschi
- Francesco Albani
- Francesco Algarotti
- Francesco Andreini
- Francesco Balducci Pegolotti
- Francesco Bartolozzi
- Francesco Berni
- Francesco Borromini
- Francesco Bracciolini
- Francesco Bussone da Carmagnola
- Francesco Caracciolo
- Francesco Crispi
- Francesco Dall'Ongaro
- Francesco de Sanctis
- Francesco Ferruccio
- Francesco Filelfo
- Francesco Guardi
- Francesco Guicciardini
- Francesco Maria Appendini
- Francesco Scipione, marchese di Maffei
- Francesco Sforza Pallavicino
- Franche-Comté
- Francia
- Franciabigio
- Francis Aickin
- Francis Alexander
- Francis Atterbury
- Francis Bacon
- Francis Beaumont
- Francis Blomefield
- Francis Bowen
- Francis Burdett
- Francis Carruthers Gould
- Francis Cottington, 1st Baron Cottington
- Francis Danby
- Francis de Sales
- Francis Dhanis
- Francis Edward Bache
- Francis Edward Clark
- Francis Edward Smedley
- Francis Egerton, 1st Earl of Ellesmere
- Francis Egerton, 8th Earl of Bridgewater
- Francis Englefield
- Francis Garnier
- Francis Hastings Doyle
- Francis Hay, 9th Earl of Erroll
- Francis Higginson
- Francis Hopkinson Smith
- Francis Hutcheson (philosopher)
- Francis I of the Two Sicilies
- Francis I, Holy Roman Emperor
- Francis II of the Two Sicilies
- Francis II, Duke of Brittany
- Francis James Child
- Francis L. Hawks
- Francis Lambert
- Francis Landey Patton
- Francis Lathrop
- Francis Leggatt Chantrey
- Francis Lieber
- Francis Lovell, 1st Viscount Lovell
- Francis March
- Francis Marion Crawford
- Francis Marion
- Francis Mason
- Francis Meres
- Francis Napier, 10th Lord Napier
- Francis of Mayrone
- Francis Osborne, 5th Duke of Leeds
- Francis Preston Blair Jr.
- Francis Preston Blair
- Francis Quarles
- Francis Rawdon Chesney
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- Francis Wayland
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- Francis Wilkinson Pickens
- Francis William Newman
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- Francis Xavier
- Franciscans
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- Francisco de Zurbarán
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- Francisco Goya
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- Francisco José Freire
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- Franciscus Accursius
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- Francisque Sarcey
- Francistown
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- Francken family
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- François and Michel Anguier
- François Andrieux
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- François Christophe Edmond de Kellermann
- François Claude Amour, marquis de Bouillé
- François Clouet
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- François de Bar
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- François de Beauvais, Seigneur de Briquemault
- François de Boivin
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- François de Bourbon, Prince of Conti
- François de Chasseloup-Laubat
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- François Denis Tronchet
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- François Hemsterhuis
- François Henri Turpin
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- François Joseph Lagrange-Chancel
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- François Joseph Paul de Grasse
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- François Jules Edmond Got
- François Jules Pictet de la Rive
- François Just Marie Raynouard
- François Laurent
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- François Leclerc du Tremblay
- François Lenormant
- François Louis Bourdon
- François Louis, Prince of Conti
- François Marius Granet
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- François Mignet
- François Pétis de la Croix
- François Ponsard
- François Quesnay
- François René Mallarmé
- François Roger de Gaignières
- François Rude
- François Sébastien Charles Joseph de Croix, Count of Clerfayt
- François Séverin Marceau
- François Sulpice Beudant
- François Victor Alphonse Aulard
- François Villon
- Francois Xavier Martin
- François-Adrien Boieldieu
- François-André Danican Philidor
- François-Benoît Hoffman
- François-Emmanuel Guignard, comte de Saint-Priest
- François-Henri de Montmorency, duc de Luxembourg
- François-Joachim de Pierre de Bernis
- François-Joseph Fétis
- François-Joseph Gossec
- François-Joseph Talma
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- François-Louis Français
- François-Marie Raoult
- François-Marie-Benjamin Richard
- François-Marie, 1st duc de Broglie
- François-Marie, marquis de Barthélemy
- François-Michel le Tellier, Marquis de Louvois
- François-Nicolas-Benoît Haxo
- François-Noël Babeuf
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- François-Xavier de Feller
- François, Vicomte de Curel
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- Francolin
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- Frangula purshiana
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- Frankenstein
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- Franz Abt
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- Franz Brünnow
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- Franz Ernst Brückmann
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- Franz Heinrich Ludolf Ahrens
- Franz Hermann Schulze-Delitzsch
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- Franz Karl Movers
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- Franz Mayer Museum
- Franz Miklosich
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- Frederick Crace Calvert
- Frederick David Mocatta
- Frederick Dielman
- Frederick Greenwood
- Frederick Henry Marvell Blaydes
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- Frederick Hervey, 4th Earl of Bristol
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- Gaius Julius Civilis
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- Gaius
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- Galaxiidae
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- Galaxy formation and evolution
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- Galaxy groups and clusters
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- Galaxy morphological classification
- Galaxy rotation curve
- Galaxy
- Galba
- Galbanum
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- Galeras
- GALEX
- Galicia (Eastern Europe)
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- Galileo project
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- Gallabat
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- Gallaudet University
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- Galleting
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- Gallium nitride
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- Galois group
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- Game design
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- Game
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- Gao Empire
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- Gap theorem
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- Gar
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- Garden design
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- Garden
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- Gardenia
- Gardening
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- Gargoyle
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- Gasparo Gozzi
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- Gasterosteiformes
- Gaston Audiffret-Pasquier
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- Gaston, Duke of Orléans
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- Gastropoda
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- Gateway Arch
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- Gatling gun
- Gauche effect
- Gauḍa (city)
- Gaudenzio Ferrari
- Gauge boson
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- Gauge theory
- Gaul
- Gauls
- Gaultheria procumbens
- Gaur
- Gaurishankar Udayshankar
- Gauss (unit)
- Gauss–Seidel method
- Gauss's law for magnetism
- Gauss's law
- Gauss's method
- Gaussian elimination
- Gaussian function
- Gaussian integer
- Gaussian network model
- Gaussian units
- Gautama Buddha
- Gauteng
- Gauthier de Costes, seigneur de la Calprenède
- Gautier d'Arras
- Gavar
- Gavdos
- Gavel
- Gavelkind
- Gavriil Golovkin
- Gaya (India)
- Gayatri Mantra
- GAZ
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- Gazaland
- Gazelle
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- Gaziantep
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- GCHQ
- Gdańsk
- GDK
- Gdynia
- GE Transportation
- Ge'alya
- Geac Computer Corporation
- Gear
- Geb
- Gebhard Leberecht von Blücher
- Gebhard Truchsess von Waldburg
- Gecko
- Gedenkdienst
- Gédéon Tallemant des Réaux
- Gediminas
- Gee (Girls' Generation song)
- Geek
- Geel
- Geert Groote
- Gegenschein
- Geiger counter
- Geiger–Marsden experiments
- Geirangerfjord
- Gel electrophoresis
- Gel permeation chromatography
- Gel
- Gelada
- Gelderland
- Geldern
- Gelon
- Gelsemium
- Gelsenkirchen
- Gelug
- Gemäldegalerie, Berlin
- Gematria
- Geminal diol
- Geminal
- Gemini (constellation)
- Gemini Observatory
- Gemistos Plethon
- Gemmi Pass
- Gemstone
- Gendarmerie
- Gender equality
- Gender role
- Gender studies
- Gender
- Gene expression
- Gene flow
- Gene therapy
- Gene
- Genealogy
- General Agreement on Tariffs and Trade
- General anaesthetic
- General Dynamics F-16 Fighting Falcon
- General Electric
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- General MIDI
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- General recursive function
- General relativity
- General Santos
- General State Laws for the Prussian States
- General strike
- General ticket
- General topology
- General-purpose computing on graphics processing units
- General-purpose macro processor
- Generalized anxiety disorder
- Generalized coordinates
- Generalized Petersen graph
- Generalplan Ost
- Generating function
- Generation (particle physics)
- Generation
- Generative grammar
- Genesis creation narrative
- Genet (animal)
- Genetic admixture
- Genetic code
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- Genetic history of Europe
- Genetic linkage
- Genetic recombination
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- Genetically modified crops
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- Genetically modified tree
- Genetics
- Geneva Bible
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- Geneva
- Genevieve of Brabant
- Genghis Khan
- Genital herpes
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- Gennadius Scholarius
- Genoa
- Genocidal rape
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- Genoese colonies
- Genome editing
- Genome
- Genomics
- Genotype
- Genovesi
- Genoveva
- Genpei War
- Genre fiction
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- Gentili
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- Gentrification
- Genu varum
- Genus
- Geochemical cycle
- Geochemistry
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- Geodimeter
- Geoduck aquaculture
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- Geodynamics
- Geoffrey (archbishop of York)
- Geoffrey de Mandeville, Earl of Essex
- Geoffrey de Montbray
- Geoffrey Fenton
- Geoffrey Fitz Peter, 1st Earl of Essex
- Geoffrey Hornby
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- Geoffrey the Baker
- Geoffroi Jacques Flach
- Geoglyph
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- Geographic data and information
- Geographic information system
- Geographical zone
- Geography of Afghanistan
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- Geoid
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- Geological history of oxygen
- Geology of Hertfordshire
- Geology of Mars
- Geology of Mercury
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- Geology of the Moon
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- Geology
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- Geomathematics
- Geometer moth
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- Geoponici
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- George Goring, 1st Earl of Norwich
- George Goring, Lord Goring
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- Globally Harmonized System of Classification and Labelling of Chemicals
- Globe
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- Glossary
- Gloucestershire
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- Gondar
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- Gondola lift
- Gondwana
- Gone with the Wind (film)
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- Gonepteryx rhamni
- Gonfalon
- Gong Zizhen
- Gong
- Goniophora
- Gonorrhea
- Gonorynchiformes
- Gonostomatidae
- Gonzales Coques
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- Good and evil
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- Good Vibrations
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- Google Chrome
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- Goose
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- Gorgias
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- Görlitz
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- Goslin
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- Gospel music
- Gospel of John
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- Gossypium hirsutum
- Gossypium
- Göta Canal
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- Gotarzes I
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- Gothic War (535–554)
- Goths
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- Götz
- Gouache
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- Gough Island
- Gould Belt
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- Gourami
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- Gouverneur K. Warren
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- Govert Flinck
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- Gozo
- GQ
- Graaff-Reinet
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- Grace Aguilar
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- Graciosa
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- Gradian
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- Graeco-Arabic translation movement
- Graecopithecus
- Graf
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- Grafrath
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- Gram-negative bacteria
- Gram-positive bacteria
- Gram
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- Grand duke
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- Granville Sharp
- Grape
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- Graph automorphism
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- Graph isomorphism
- Graph minor
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- Graphemics
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- Graphite oxide
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- Grapsus grapsus
- Graptolite
- Grass carp
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- Gratian
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- Gravitational time dilation
- Gravitational wave
- Gravitational-wave astronomy
- Gravitational-wave observatory
- Graviton
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- Gray (unit)
- Gray langur
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- Grays, Essex
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- Great Artesian Basin
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- Great circle
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- Great Lakes–St. Lawrence Lowlands
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- Great man theory
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- Great Russian Encyclopedia
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- Great Shamokin Path
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- Greater Khingan
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- Greater kudu
- Greater London
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- Greater painted-snipe
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- Greatest common divisor
- Greatest element and least element
- Grebe
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- Greece
- Greed (1924 film)
- Greed
- Greek alphabet
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- Greek primordial deities
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- Green algae
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- Green sea turtle
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- Green's theorem
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- Greenore
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- In Search of Lost Time
- In situ chemical oxidation
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- Inclinometer
- Inclusion compound
- Inclusion–exclusion principle
- Income statement
- Income tax
- Incompressible flow
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- Internet linguistics
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- Internet Message Access Protocol
- Internet of things
- Internet protocol suite
- Internet Protocol
- Internet Relay Chat
- Internet service provider
- Internet slang
- Internet
- Interpersonal attraction
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- Interplanetary dust cloud
- Interplanetary medium
- Interplate earthquake
- Interpol
- Interpolation
- Interpretation (model theory)
- Interpretations of quantum mechanics
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- Interpretive discussion
- Interpunct
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- Interrogation
- Interrupt
- Intersection (road)
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- Intersection graph
- Intersectionality
- Interservice rivalry
- Interslavic
- Interstate Highway System
- Interstellar cloud
- Interstellar ice
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- Interstellar travel
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- Interstitial webpage
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- Intertropical Convergence Zone
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- Interview
- Interwar period
- Intestinal gland
- Into the Jaws of Death
- Intolerance (film)
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- Intraplate earthquake
- Intravenous therapy
- Intrinsic and extrinsic properties (philosophy)
- Introduction (writing)
- Introduction to entropy
- Introduction to evolution
- Introduction to gauge theory
- Introduction to general relativity
- Introduction to genetics
- Introduction to quantum mechanics
- Introduction to viruses
- Intron
- Introspection
- Intrusive rock
- Intuit
- Intuitionistic logic
- Inuit
- Inuktitut
- Iñupiaq language
- Inuyasha
- Invasion and rebellion of the Five Barbarians
- Invasion of Poland
- Invasion of the Waikato
- Invasion
- Invasive species
- Invention
- Inverbervie
- Inverness
- Inverse function
- Inverse hyperbolic functions
- Inverse second
- Inverse trigonometric functions
- Invertebrate
- Inverter (logic gate)
- Investigative journalism
- Investiture Controversy
- Investiture of the Gods
- Investment banking
- Investment
- Investor
- Invisible Man
- Io (moon)
- Ioan Sturdza
- Ioannina
- Ioannis Kapodistrias
- Iodide
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- Ion C. Brătianu
- Ion chromatography
- Ion track
- Ion
- Ionian Islands
- Ionian Revolt
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- Ionian Sea
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- Ionization energy
- Ionization
- Ionizing radiation
- Ionosphere
- Iophon
- IOS
- Iosif Gurko
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- IP address
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- IPv4
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- Iron(II,III) oxide
- Iron(II) oxide
- Iron(II) sulfate
- Iron(III) chloride
- Iron(III) citrate
- Iron(III) oxide
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- Iron
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- Irtysh
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- Irun
- Irving Ramsey Wiles
- Irvingia gabonensis
- Is–ought problem
- Isaac Alfasi
- Isaac Ambrose
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- Isaac Dorislaus
- Isaac Hecker
- Isaac Hollister Hall
- Isaac I Komnenos
- Isaac II Angelos
- Isaac Israeli ben Solomon
- Isaac Manasses de Pas, Marquis de Feuquieres
- Isaac Mayer Wise
- Isaac Newton
- Isaac of Antioch
- Isaac Oliver
- Isaac Reed
- Isaac René Guy le Chapelier
- Isaac Taylor
- Isaac Todhunter
- Isaac van Ostade
- Isaac Watts
- Isaac
- Isaak August Dorner
- Isaak Markus Jost
- Isabeau of Bavaria
- Isabela Island (Galápagos)
- Isabella Andreini
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- Isabella I of Castile
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- Isaiah Horowitz
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- Isaiah
- Isanavarman
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- Ishmael
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- Isidor Kalisch
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- Islam by country
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- Isobryales
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- Isomerization
- Isomorphism
- Isopoda
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- Isosceles triangle
- Isospin
- Isostasy
- Isothermal process
- Isotope geochemistry
- Isotope
- Isotopes of beryllium
- Isotopes of boron
- Isotopes of carbon
- Isotopes of fluorine
- Isotopes of helium
- Isotopes of hydrogen
- Isotopes of lithium
- Isotopes of neon
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- Isotopes of oxygen
- Isotopes of protactinium
- Isoxazole
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- Israel Isserlein
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- Isthmus of Corinth
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- Isthmus
- Istihsan
- István Bethlen
- István Gyöngyösi
- István Széchenyi
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- Isyllus
- It Happened One Night
- It Takes a Nation of Millions to Hold Us Back
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- Itacolumite
- Itagaki Taisuke
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- Itch
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- Itius Portus
- Itō Hirobumi
- Itoigawa-Shizuoka Tectonic Line
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- ITunes
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- Itzehoe
- IUPAC nomenclature of inorganic chemistry
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- Ivan Dmitriev
- Ivan Gundulić
- Ivan III of Russia
- Ivan Krylov
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- Ivan the Terrible and His Son Ivan
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- Ivan VI of Russia
- Ivangorod
- Ivanhoe
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- Izvestia
- J-pop
- J. B. Lightfoot
- J. C. Ryle
- J. F. Oberlin
- J. Fred Muggs
- J. Paul Getty Museum
- J.-H. Rosny
- J/psi meson
- Ja'alin tribe
- Ja'fari jurisprudence
- Jabalpur
- Jabez Bunting
- Jacamar
- Jacanidae
- Jack (device)
- Jack and the Beanstalk
- Jack Ketch
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- Jackhammer
- Jackson, Mississippi
- Jackson's chameleon
- Jackson's Mill
- Jacksonville, Florida
- Jacob Albright
- Jacob Anatoli
- Jacob Astley, 1st Baron Astley of Reading
- Jacob Cats
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- Jacob Frank
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- Jacob Gould Schurman
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- Jacob Jordaens
- Jacob Leisler
- Jacob Magnus Sprengtporten
- Jacob Maris
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- Jacob Perkins
- Jacob sheep
- Jacob Spon
- Jacob Sturm von Sturmeck
- Jacob Tonson
- Jacob van Lennep
- Jacob van Maerlant
- Jacob van Ruisdael
- Jacob's staff
- Jacob's Well
- Jacob
- Jacoba
- Jacobabad
- Jacobean architecture
- Jacobi method
- Jacobi symbol
- Jacobian matrix and determinant
- Jacobin
- Jacobs Cavern
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- Jacopo Aconcio
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- Jacopo Sadoleto
- Jacquard machine
- Jacqueline de Rohan, Marquise de Rothelin
- Jacqueline Kennedy Onassis
- Jacqueline Pascal
- Jacqueline, Countess of Hainaut
- Jacques Amand Eudes-Deslongchamps
- Jacques Amyot
- Jacques Antoine Marie de Cazalès
- Jacques Arcadelt
- Jacques Auguste de Thou
- Jacques Babinet
- Jacques Basnage
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- Jacques Boucher de Crèvecœur de Perthes
- Jacques Bridaine
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- Jacques Cassini
- Jacques Charles François Sturm
- Jacques Charles
- Jacques Claude Beugnot
- Jacques Claude Demogeot
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- Jacques Cœur
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- Jacques Cujas
- Jacques d'Albon, Seigneur de Saint André
- Jacques d'Armagnac
- Jacques Davy Duperron
- Jacques de Lalaing
- Jacques Grévin
- Jacques Guillaume Thouret
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- Jacques Lauriston
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- Jacques Lenfant
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- Jacques Marie Boutet
- Jacques Marie Eugène Godefroy Cavaignac
- Jacques Necker
- Jacques Pierre Brissot
- Jacques Raymond Brascassat
- Jacques Sarazin
- Jacques Sirmond
- Jacques Vallée, Sieur Des Barreaux
- Jacques-Antoine Manuel
- Jacques-Arsène d'Arsonval
- Jacques-Bénigne Bossuet
- Jacques-Émile Blanche
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- Jacques-François Blondel
- Jacques-Henri Bernardin de Saint-Pierre
- Jacques-Nicolas Billaud-Varenne
- Jacques, Duke of Nemours
- Jactitation
- Jade Emperor
- Jade
- Jaekelopterus
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- Jagir
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- Jaguarundi
- Jahannam
- Jahdiel
- Jahleel Brenton
- Jahrom
- Jaime Balmes
- Jainism
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- Jakarta Enterprise Beans
- Jakarta
- Jakob Abbadie
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- Jakova
- Jakun people
- Jalalabad
- Jalali calendar
- Jalandhar
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- Jalapeño
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- Jalaun
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- JAMA
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- Jamaican Patois
- Jamakhandi
- Jamb
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- Jambi
- James A. Herne
- James Abbott McNeill Whistler
- James Abercromby, 1st Baron Dunfermline
- James Albery
- James Anderson (lawyer)
- James Anderson of Hermiston
- James Anthony Froude
- James Audley
- James Augustus Cotter Morison
- James Augustus Grant
- James Augustus St. John
- James B. Greenough
- James B. McPherson
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- James Baillie Fraser
- James Bay
- James Bond (literary character)
- James Bond Theme
- James Bowling Mozley
- James Bradley Thayer
- James Bradley
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- James Bruce
- James Brudenell, 7th Earl of Cardigan
- James Bryce, 1st Viscount Bryce
- James Brydges, 1st Duke of Chandos
- James Burbage
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- James Butler, 2nd Duke of Ormonde
- James Carroll Beckwith
- James City Shire
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- James Clerk Maxwell
- James Cockle
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- James Craggs the Elder
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- James Crichton
- James Croft
- James Dalrymple, 1st Viscount of Stair
- James David Forbes
- James David Smillie
- James de la Cloche
- James Douglas, 2nd Earl of Douglas
- James Douglas, 9th Earl of Douglas
- James Duffield Harding
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- James FitzJames, 1st Duke of Berwick
- James Ford Rhodes
- James Francis Edward Keith
- James Frederick Ferrier
- James Freeman Clarke
- James G. Blaine
- James G. King
- James Gairdner
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- Kryvyi Rih
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- Kurashiki
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- Kurdish languages
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- Kurtosis
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- Kut
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- Kwajalein Atoll
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- Kwanyama dialect
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- Kyzyl
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- L'Aquila
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- La Chaux-de-Fonds
- La Ciotat
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- La Cucaracha
- La Dolce Vita
- La Ferrassie 1
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- La Flèche
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- La Gomera
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- La Grace
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- La Guaira
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- La mer (Debussy)
- La Palma
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- La Réole
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- La Rioja
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- Laconicum
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- Ladder
- Ladislaus Hunyadi
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- Ladislav
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- Lagerpetidae
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- Lagrangian mechanics
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- Lah number
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- Lake Chilwa
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- Lake ecosystem
- Lake Edward
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- Lake Placid, New York
- Lake Pontchartrain
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- Lakes of Killarney
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- Lakhmids
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- Lalibela
- Lalitpur district, India
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- Lamalou-les-Bains
- Lamarckism
- Lamb of God
- Lambaesis
- Lamballe
- Lambda calculus
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- Lambeosaurus
- Lambert Bos
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- Lambert W function
- Lambert-Sigisbert Adam
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- Lamego
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- Laminar flow
- Laminaria
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- Languriini
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- Lant Carpenter
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- Lanthanide
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- Lao language
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- Laplace operator
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- Lapsi (Christianity)
- Laptev Sea
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- Lar gibbon
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- Larak Island
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- Larbert
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- Large Hadron Collider
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- Lashkargah
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- Lathe
- Latin alphabet
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- Laurentia
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- Lead
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- Length
- Leninism
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- Lent
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- Leo (constellation)
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- Leo Tolstoy
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- Léon Bonnat
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- Leonard Bacon
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- Leonard Horner
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- Leonhard Hutter
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- Leopold II, Holy Roman Emperor
- Leopold Joseph von Daun
- Leopold McClintock
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- Leotychidas II
- Lepadiformes
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- Lepidoptera
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- Leprosy
- Leptaena
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- Leptodactylidae
- Leptolepidae
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- Lepton
- Leptosporangiate fern
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- Lernaean Hydra
- Les Arsures
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- Let's Get It On
- Let's Make a Deal
- Lethality
- Letter (alphabet)
- Letter of Jeremiah
- Letter-quality printer
- Letters rogatory
- Lettuce
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- Levantine archaeology
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- Lever
- Leviathan (Hobbes book)
- Leviathan Cave
- Leviathan
- Levin August von Bennigsen
- Levin Schücking
- Levoča
- Levulinic acid
- Lew Wallace
- Lewanika
- Lewis acids and bases
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- Lewis and Harris
- Lewis Edwards
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- Lewis structure
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- Lex Luthor
- Lex mercatoria
- Lexicographic order
- Lexicology
- Lexicon Technicum
- Lexicon
- Lexington, Kentucky
- Lexis (linguistics)
- Leyden jar
- Leyte
- Lezgins
- LG Corporation
- LGBT history in the United States
- Lhasa (prefecture-level city)
- Lhasa Tibetan
- Lhasa
- Li Bai
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- Lianyungang
- Liao dynasty
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- Libeccio
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- Libmanan
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- Library of Congress
- Library of the Russian Academy of Sciences
- Library
- Libration
- LibreOffice
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- License
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- Lictor
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- Lie
- Liechtenstein
- Lied
- Liegau-Augustusbad
- Liège Province
- Liège
- Liepāja
- Lier, Belgium
- Lieutenant general
- Lieuwe van Aitzema
- Life (magazine)
- Life extension
- Life insurance
- Life of Jesus in the New Testament
- Life of Pi
- Life of Samuel Johnson
- Life on Mars
- Life stance
- Life support
- Life
- Lifestyle magazine
- Lift (force)
- Lifting equipment
- Ligand (biochemistry)
- Ligand cone angle
- Ligand field theory
- Ligand
- Ligao
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- Light curve
- Light fixture
- Light in August
- Light music
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- Light-dependent reactions
- Light-emitting diode
- Light-year
- Light
- Lightheadedness
- Lighthouse of Alexandria
- Lighthouse
- Lighting
- Lightning rod
- Lightning strike
- Lightning
- Lightweight Directory Access Protocol
- Lightweight protocol
- Ligia
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- Likasi
- Like a Rolling Stone
- Like a Virgin (song)
- Lil Bub
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- Lilongwe
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- Lily of the valley
- Lima bean
- Lima Group
- Lima
- Limassol
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- Limbers and caissons
- Limburg (Belgium)
- Limburg (Netherlands)
- Limburg Chronicle
- Limburgish
- Limburgite
- Lime (color)
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- Lime sulfur
- Limerick (poetry)
- Limerick
- Limes Germanicus
- Limestone
- Limewater
- Liminality
- Liming (leather processing)
- Limit (category theory)
- Limit (mathematics)
- Limit cycle
- Limit of a function
- Limit of a sequence
- Limited government
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- Limits of integration
- Limnognathia
- Limnology
- Limoges enamel
- Limoges
- Limon Bay
- Limonene
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- Limousin
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- Limpopo
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- Linckia laevigata
- Lincoln Memorial
- Lincoln, Nebraska
- Lincolnshire
- Lindane
- Lindbergh kidnapping
- Line (geometry)
- Line (software)
- Line (unit)
- Line dance
- Line engraving
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- Line integral
- Line Islands
- Line of purples
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- Line-replaceable unit
- Line–line intersection
- Linear A
- Linear algebra
- Linear approximation
- Linear B
- Linear combination of atomic orbitals
- Linear differential equation
- Linear dynamical system
- Linear equation
- Linear function (calculus)
- Linear map
- Linear molecular geometry
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- Linear particle accelerator
- Linear polarization
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- Linear regression
- Linear Tape-Open
- Linearization
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- Lingala
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- Lingdingyang
- Lingga Regency
- Lingnan
- Lingqu
- Lingua franca
- Linguistic anthropology
- Linguistic description
- Linguistic rights
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- Linguistics
- Lingulata
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- Link (unit)
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- Linköping
- Linoproductus
- Linstock
- Linux
- Linyphiidae
- Linz
- Lion Monument
- Lion of Venice
- Lion Rock
- Lion tamarin
- Lion-man
- Lion's mane jellyfish
- Lion
- Lionel Cranfield, 1st Earl of Middlesex
- Lionel of Antwerp, Duke of Clarence
- Lionel Sackville-West, 2nd Baron Sackville
- Liopleurodon
- Liouville's theorem (complex analysis)
- Lipetsk
- Lipid bilayer
- Lipid profile
- Lipid
- Lipizzan
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- Lipopolysaccharide
- Lipoprotein
- Lippi
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- Liquefied natural gas terminal
- Liquefied natural gas
- Liquefied petroleum gas
- Liquid crystal
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- Liquid helium
- Liquid hydrogen
- Liquid nitrogen
- Liquid oxygen
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- Liquid–liquid extraction
- Liquid
- Liquidambar
- Liquor
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- Liriodendron
- Liroconite
- Lisbon
- Lisp (programming language)
- Lissajous orbit
- List (abstract data type)
- List of art schools
- List of biblical names starting with B
- List of biblical names starting with P
- List of Chinese inventions
- List of cognitive biases
- List of companies of Germany
- List of copper alloys
- List of countries by greenhouse gas emissions
- List of counts and dukes of Montpensier
- List of counts and dukes of Vendôme
- List of courts of the United States
- List of dams and reservoirs
- List of desktop publishing software
- List of environmental issues
- List of extant baronetcies
- List of fashion magazines
- List of feeding behaviours
- List of graphical methods
- List of halls and walks of fame
- List of index fossils
- List of Intel chipsets
- List of international submarine communications cables
- List of interstellar and circumstellar molecules
- List of inventions in the medieval Islamic world
- List of islands of Bahrain
- List of islands of Kuwait
- List of islands of Qatar
- List of islands of the United States
- List of ITU-T V-series recommendations
- List of Knights of the Baltimore City College
- List of knots
- List of literary movements
- List of lords and princes of Joinville
- List of minor biblical places
- List of minor biblical tribes
- List of minor Old Testament figures, A–K
- List of minor Old Testament figures, L–Z
- List of musical instruments by Hornbostel–Sachs number: 322.11
- List of musical instruments by Hornbostel–Sachs number: 322.12
- List of national anthems
- List of national legal systems
- List of naval weapon systems
- List of particles
- List of peaks named Baldy
- List of plants known as bottlebrush
- List of prime ministers of Canada
- List of printing protocols
- List of regions of Japan
- List of regions of the United States
- List of reportedly haunted locations
- List of rulers of Montferrat
- List of rural localities in Vologda Oblast
- List of surveying instruments
- List of the most distant astronomical objects
- List of toolkits
- List of ukiyo-e terms
- List of unsolved problems in physics
- List of video connectors
- Lists of animal diseases
- Lists of constellations
- Lists of islands
- Lists of legislation
- Lists of universities and colleges
- Litany
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- Liternum
- Lithic sandstone
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- Lithium borohydride
- Lithium nitride
- Lithium oxide
- Lithium peroxide
- Lithium polymer battery
- Lithium sulfide
- Lithium-ion battery
- Lithium
- Lithography
- Lithophane
- Lithophone
- Lithosphere
- Lithostratigraphy
- Lithuania
- Lithuanian language
- Litmus
- Litoměřice
- Litopterna
- Litre
- Litter (vehicle)
- Little Belt
- Little Britain
- Little egret
- Little finger
- Little House on the Prairie
- Little Ice Age
- Little Nemo
- Little owl
- Little penguin
- Little Red Riding Hood
- Little Rock, Arkansas
- Little Wobby, New South Wales
- Little Women
- Little Yellow Jacket
- Liturgical year
- Liturgy of Preparation
- Liturgy
- Live Earth
- Liver cancer
- Liver of sulfur
- Liver
- Livermorium
- Liverpool
- Liversedge
- Livery collar
- Lives of the Most Excellent Painters, Sculptors, and Architects
- Livestock dehorning
- Livestock guardian dog
- Livestock
- Livestreaming
- Living fossil
- Living museum
- Living room
- Livingstone, Zambia
- Livno
- Livonian Order
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- Livorno
- Livyatan
- Lizard
- Lizzie McGuire
- Ljubljana
- Llama
- Llandeilo Group
- Llandilo, New South Wales
- Llandovery Epoch
- Lloyd Kenyon, 1st Baron Kenyon
- Llywelyn
- Lo Spagna
- Lo-fi music
- Loach
- Load balancing (computing)
- Load factor (electrical)
- Load management
- Load-following power plant
- Loam
- Loan
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- Lobopodia
- Lobster trap
- Lobster
- Local access and transport area
- Local anesthetic
- Local Bubble
- Local community
- Local government
- Local Group
- Local Interstellar Cloud
- Local Sheet
- Local Void
- Localized molecular orbitals
- Location of Earth
- Location-based service
- Loch Ericht
- Loch Fyne
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- Loch Morar
- Loch Ness Monster
- Loch Ness
- Loch Shiel
- Loches
- Lochgelly
- Lochmaben
- Lock (water navigation)
- Lock and key
- Lockharts of Lee
- Lockheed C-130 Hercules
- Lockheed Constellation
- Lockheed L-1011 TriStar
- Lockheed Martin F-22 Raptor
- Lockheed Martin F-35 Lightning II
- Lockheed Martin
- Lockheed SR-71 Blackbird
- Lockout (industry)
- Locmariaquer
- Locomotive
- Locoweed
- Locus (mathematics)
- Locust tree
- Locust
- Locustellidae
- Lodging
- Lodowicke Muggleton
- Łódź Voivodeship
- Łódź
- Loess Plateau
- Loess
- Loewe v. Lawlor
- Lofoi Falls
- Lofoten
- Loft
- Logarithm
- Loggerhead sea turtle
- Logia
- Logic gate
- Logic level
- Logic programming
- Logic
- Logical connective
- Logical positivism
- Logistic regression
- Logistics
- Logo (programming language)
- Logo
- Logographer (history)
- Logos
- Logothete
- Logroño
- Loharu
- Lohengrin (opera)
- Loin
- Loire-Atlantique
- Loire
- Lojban
- Lojong
- Loki
- Lokoja
- Lokrum
- Lola Montez
- Lolita (orca)
- Lolita fashion
- Lolita
- Lolium temulentum
- Lollardy
- Lomaum Dam
- Lombard League
- Lombardo (family)
- Lombardo
- Lombards
- Lombardy
- Lombok Strait
- Lombok
- Lomé
- Lonavala
- London Bridge
- London Calling
- London dispersion force
- London Eye
- London School of Economics
- London Underground
- London, Ontario
- London
- Loneliness
- Lonesome George
- Long Beach, California
- Long Day's Journey into Night
- Long Depression
- Long division
- Long gun
- Long Island Sound
- Long Island
- Long March
- Long Now Foundation
- Long pepper
- Long ton
- Long Xuyên
- Long-tailed duck
- Long-tailed weasel
- Longbow
- Longchen Nyingthig
- Longclaw
- Longcloth
- Longdé
- Longevity
- Longfin mako shark
- Longhorn beetle
- Longisquama
- Longitude of the periapsis
- Longitude
- Longitudinal wave
- Longleaf pine
- Longline fishing
- Longman
- Longmyndian Supergroup
- Longquan celadon
- Longsword
- Longus
- Longyearbyen
- Longzhou County
- Loni, Ghaziabad
- Loo table
- Look Back in Anger
- Looking Back in Anger
- Lookism
- Lookup table
- Loom
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- Looney Tunes
- Loosestrife
- Looting
- Lop Desert
- Lop Nur
- Lope de Rueda
- Lope de Vega
- Loperamide
- Lophius
- Lophostemon confertus
- Lophotrochozoa
- Loralai
- Loratadine
- Lord Charles Beresford
- Lord Edward FitzGerald
- Lord George Gordon
- Lord Herries of Terregles
- Lord Howe Island
- Lord Jim
- Lord Justice Clerk
- Lord Mayor's Day
- Lord Nairne
- Lord of the Flies
- Lord Polwarth
- Lord Randolph Churchill
- Lord Robert Somerset
- Lord William Howard
- Lord William Russell
- Lord's Prayer
- Lord
- Lorentz factor
- Lorentz force
- Lorentz National Park
- Lorentz transformation
- Lorentz–Heaviside units
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- Lorenz Oken
- Lorenzo Bartolini
- Lorenzo Bellini
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- Lorenzo Dow
- Lorenzo Valla
- Lorestan province
- Loreto, Marche
- Loricariidae
- Loriini
- Lorium
- Lorraine cycle
- Lorraine
- Los Angeles International Airport
- Los Angeles Times
- Los Angeles
- Los Lagos Region
- Los Ríos Region
- Lose Yourself
- Losing stream
- Lošinj
- Loss function
- Lost (TV series)
- Lost Decades
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- Lot (biblical person)
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- Lothair I
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- Lötschberg
- Lotus position
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- Louis Agassiz
- Louis Alan Hazeltine
- Louis Aleman
- Louis Alexandre, Count of Toulouse
- Louis Antoine de Saint-Just
- Louis Antoine Fauvelet de Bourrienne
- Louis Antoine, Duke of Enghien
- Louis Armand I, Prince of Conti
- Louis Armand II, Prince of Conti
- Louis Armstrong
- Louis Auguste Blanqui
- Louis Bertillon
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- Louis Comfort Tiffany
- Louis d'Aurelle de Paladines
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- Louis Desaix
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- Louis Eugène Marie Bautain
- Louis Faidherbe
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- Louis François Auguste Cauchois-Lemaire
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- Louis François, Prince of Conti
- Louis Gallait
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- Louis Gustave Ricard
- Louis Gustave Vapereau
- Louis Hersent
- Louis I of Hungary
- Louis II of Italy
- Louis IX of France
- Louis Jacques Thénard
- Louis Jean Marie de Bourbon, Duke of Penthièvre
- Louis Jean-Marie Daubenton
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- Louis Juchault de Lamoricière
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- Louis Philippe I, Duke of Orléans
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- Louis Philippe II, Duke of Orléans
- Louis Philippe, comte de Ségur
- Louis Pierre Édouard, Baron Bignon
- Louis Poinsot
- Louis Prosper Gachard
- Louis Racine
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- Louis Schneider (actor)
- Louis the German
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- Louis Thomas Villaret de Joyeuse
- Louis Ulbach
- Louis Veuillot
- Louis VII of France
- Louis VIII of France
- Louis X of France
- Louis XI
- Louis XII
- Louis XIII
- Louis XIV
- Louis XV
- Louis XVI and the Legislative Assembly
- Louis XVI
- Louis XVII
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- Louis-Alexandre Berthier
- Louis-Alexandre de Launay, comte d'Antraigues
- Louis-Antoine Jullien
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- Louis-Auguste-Victor, Count de Ghaisnes de Bourmont
- Louis-Désiré Véron
- Louis-Eugène Cavaignac
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- Louis-Jérôme Gohier
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- Louis-Nicolas Davout
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- Louis-René de Caradeuc de La Chalotais
- Louis-Sébastien Le Nain de Tillemont
- Louis-Sébastien Mercier
- Louis, comte de Narbonne-Lara
- Louis, Duke of Orléans (1703–1752)
- Louis, Grand Condé
- Louisa Cranstoun Nisbett
- Louise Bénédicte de Bourbon
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- Louise Rosalie Allan-Despreaux
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- Louisiana
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- Loulan Kingdom
- Lounge music
- Loupe
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- Lovász conjecture
- Love wave
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- Love's Labour's Lost
- Love
- Lovebird
- Lovere
- Loving v. Virginia
- Low back pain
- Low church
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- Low-Frequency Array (LOFAR)
- Low-ionization nuclear emission-line region
- Low-level programming language
- Low-pass filter
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- Lowboy
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- LU decomposition
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- Lucius Cornelius Balbus (proconsul)
- Lucius Cornelius Cinna
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- Lucius Lucceius
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- Lucius
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- Lucy Minnigerode
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- Lucy
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- Ludhiana
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- Ludolf Bakhuizen
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- Ludovic Vitet
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- Ludwig Friedrich Otto Baumgarten-Crusius
- Ludwig Hassenpflug
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- Ludwig Maximilian University of Munich
- Ludwig Michael Schwanthaler
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- Lufeng, Guangdong
- Lufthansa
- Luganda
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- Luhansk
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- Luigi Ferri
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- Luis Cáncer
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- Luke Fildes
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- Lullaby
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- Luna 2
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- Lunar eclipse
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- Luncheon of the Boating Party
- Lund University
- Lüneburg Heath
- Lung cancer
- Lung
- Lungfish
- Lunghi
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- Lunisolar calendar
- Lunokhod 1
- Luohe
- Luoyang
- Lupang Hinirang
- Lupemban culture
- Lupercio Leonardo de Argensola
- Lupin bean
- Lupinus
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- Luqman
- Luray Caverns
- Lurgrotte
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- Lust
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- Lustrum
- Lute
- Lutein
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- Lutheranism
- Luton
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- Luvisol
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- Lux
- Luxembourg (Belgium)
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- Luxembourg Gardens, Paris
- Luxembourg
- Luxembourgish
- Luxeuil-les-Bains
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- Lygaeidae
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- Lyman-alpha forest
- Lymantria dispar dispar
- Lyme disease
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- Lynching of Jesse Washington
- Lynching
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- Lynx
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- Lysanias
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- Lysias
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- Lysistrata
- Lysistratus
- Lysosome
- Lystrosaurus
- LZ 129 Hindenburg
- M (1931 film)
- M-theory
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- M*A*S*H
- M4 carbine
- M16 rifle
- M81 Group
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- M1911 pistol
- Má vlast
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- Maasai people
- Maasin
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- Macaronic language
- Macau
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- MacDonnell Ranges
- MacDraw
- Mace (bludgeon)
- Macedonia (ancient kingdom)
- Macedonian front
- Macedonian language
- Macedonian Wars
- Maceió
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- Macgregor Laird
- Machairodus
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- Machine code monitor
- Machine code
- Machine gun
- Machine learning
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- Machine translation
- Machine
- Machinere
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- Machu Picchu
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- Macintosh
- Mack the Knife
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- Macleaya cordata
- Maclura pomifera
- MacMillan Provincial Park
- Macomer
- MacOS
- Macquarie Island
- Macramé
- Macrauchenia
- Macro (computer science)
- Macrobius
- Macrobrachium rosenbergii
- Macroeconomics
- Macroethics and microethics
- Macroevolution
- Macronucleus
- Macrophage
- Macropodiformes
- Macroscopic scale
- Macrotermes bellicosus
- Macrotis
- Macugnaga
- Mad (magazine)
- Mad Max
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- Madagascar hissing cockroach
- Madagascar
- Madama Butterfly
- Madame Bellecour
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- Maddaloni
- Madeira Island
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- Madeleine de Scudéry
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- Mademoiselle Mars
- Madhhab
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- Madikeri
- Madison, Wisconsin
- Madiun Affair
- Madonna of Bruges
- Madras Presidency
- Madrid Metro
- Madrid
- Madrigal
- Madtsoiidae
- Madura Island
- Madurai
- Madurese language
- Maebashi
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- Mafia
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- Magadha
- Magallanes Region
- Magazine (firearms)
- Magazine
- Magdalena River
- Magdalenian
- Magdeburg
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- Magellan expedition
- Magellanic Clouds
- Magellanic spiral
- Magellanic Stream
- Magenta
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- Maghrebi Arabic
- Magic (illusion)
- Magic (supernatural)
- Magic acid
- Magic realism
- Magic square
- Magistrates' court (England and Wales)
- Maglemosian culture
- Magma chamber
- Magma
- Magna Carta
- Magna Graecia
- Magnesia ad Sipylum
- Magnesium chloride
- Magnesium citrate
- Magnesium diglutamate
- Magnesium hydroxide
- Magnesium oxide
- Magnesium sulfate
- Magnesium sulfide
- Magnesium
- Magnet
- Magnetar
- Magnetic anomaly
- Magnetic dipole
- Magnetic field
- Magnetic flux
- Magnetic moment
- Magnetic monopole
- Magnetic quantum number
- Magnetic resonance imaging
- Magnetic separation
- Magnetic storage
- Magnetic survey (archaeology)
- Magnetic susceptibility
- Magnetic tape
- Magnetic-tape data storage
- Magnetism
- Magnetite
- Magnetization
- Magneto-optic effect
- Magnetograph
- Magnetohydrodynamic generator
- Magnetohydrodynamics
- Magnetoresistance
- Magnetosphere of Jupiter
- Magnetosphere of Saturn
- Magnetosphere
- Magnetostatics
- Magnetostratigraphy
- Magnificat in E-flat major, BWV 243a
- Magnifying glass
- Magnitude (astronomy)
- Magnitude (mathematics)
- Magnolia champaca
- Magnolia
- Magnoliaceae
- Magnoliids
- Magnus Brahe (1790–1844)
- Magnus Felix Ennodius
- Magnus Gabriel De la Gardie
- Magnus Jacob Crusenstolpe
- Magnus Stenbock
- Magpie goose
- Mahabad
- Mahabharat (1988 TV series)
- Mahabharata
- Mahadev Govind Ranade
- Mahajanapadas
- Mahakam River
- Mahallat
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- Mahar
- Maharaja Nandakumar
- Maharajpur, Madhya Pradesh
- Maharashtra
- Mahasthangarh
- Mahatma Gandhi
- Mahayana
- Mahdist War
- Maheshtala
- Mahi Kantha Agency
- Mahi River
- Mahi-mahi
- Mahidpur
- Mahmud Nedim Pasha
- Mahmud of Ghazni
- Mahoba
- Mahogany
- Mahón
- Maid
- Maidan
- Maiduguri
- Maihar
- Maillard reaction
- Main battle tank
- Main chain of the Alps
- Main sequence
- Main Street (novel)
- Main-group element
- Maine Coon
- Maine de Biran
- Maine
- Mainframe computer
- Mainichi Shimbun
- Mainland Southeast Asia
- Mainland, Orkney
- Mainline Protestant
- Mains electricity by country
- Mains electricity
- Mainshock
- Maintenance (technical)
- Mainz
- Maitraka dynasty
- Maitrī
- Maiwand
- Maize
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- Majeerteen Sultanate
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- Majoidea
- Majolica
- Major and minor
- Major appliance
- Major depressive disorder
- Major general
- Major scale
- Major trauma
- Majorian
- Majuro
- Makalaka
- Makarska
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- Makassar people
- Makassar
- Makati
- Makemake
- Makerere University
- Makgadikgadi Pan
- Makhachkala
- Making-up price
- Makonde people
- Makuria
- Malabo
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- Malacca City
- Malacca Sultanate
- Malacca
- Malachite
- Malacology
- Malacostraca
- Málaga
- Malagasy language
- Malaita
- Malakand Pass
- Malang
- Malard
- Malaria
- Malaspina family
- Malaspina Glacier
- Malathion
- Malatya
- Malawi
- Malay Archipelago
- Malay language
- Malay Peninsula
- Malayala Manorama
- Malayalam
- Malayan campaign
- Malayan Emergency
- Malayan tapir
- Malayer
- Malays (ethnic group)
- Malaysia Airlines Flight 370
- Malaysia
- MALBA
- Malchin
- Malcolm IV of Scotland
- Malcolm MacColl
- Malden Island
- Maldives
- Maldivian language
- Male reproductive system
- Male
- Malé
- Malegaon
- Maleku people
- Malerkotla State
- Maletsunyane Falls
- Malfeasance in office
- Malgudi Days (TV series)
- Mali Empire
- Mali War
- Mali
- Malic acid
- Maliki
- Malkuth
- Mallard
- Mallarino–Bidlack Treaty
- Mallawan
- Malleus Maleficarum
- Mallophaga
- Mallorca
- Mallos de Riglos
- Malmö
- Malnutrition
- Malstatt-Burbach
- Malta (island)
- Malta
- Maltese dog
- Maltese language
- Malthusianism
- Maltose
- Maluku (province)
- Maluku Islands
- Malvaceae
- Malwa Sultanate
- Malware
- Maly Lyakhovsky Island
- Maly Taymyr Island
- Mamba
- Mamberamo River
- Mambo (dance)
- Mamenchisauridae
- Mamertines
- Mamluk Sultanate
- Mamluk
- Mammal
- Mammaliaformes
- Mammalogy
- Mammee apple
- Mammoth Cave National Park
- Mammoth
- Mamucium
- Mamund
- Man at the Crossroads
- Man o' War
- Man of La Mancha
- Man with a Movie Camera
- Man-portable air-defense system
- Man
- Manacor
- Manado
- Management accounting
- Management information system
- Management
- Managua
- Manakin
- Manama
- Manannán mac Lir
- Manaoag
- Manasir
- Manasseh Cutler
- Manatee
- Manaus
- Manawatū-Whanganui
- Manbhum
- Manbij
- Manchester Baby
- Manchester computers
- Manchester Mark 1
- Manchester Ship Canal
- Manchester, New Hampshire
- Manchester
- Manchu people
- Manchukuo
- Manchuria
- Manciple
- Mandaean Book of John
- Mandaeism
- Mandala
- Mandalay
- Mandaluyong
- Mandamus
- Mandara Mountains
- Mandarin Chinese
- Mandarin orange
- Mandate of Heaven
- Mandaue
- Mandelbrot set
- Mandelic acid
- Mandhata
- Mandi (Mandaeism)
- Mandible
- Mandla
- Mandolin
- Mandraka Falls
- Mandrake the Magician
- Mandrill
- Mandsaur
- Manduria
- Mandvi
- Maned wolf
- Manfred, King of Sicily
- Manfred
- Manfredo Fanti
- Manfredonia
- Mang Lon
- Manga
- Mangabey
- Mangaia
- Mangaldan
- Mangaldas Nathubhoy
- Mangalore
- Manganate
- Manganese
- Mangang
- Manganite
- Mangaung Metropolitan Municipality
- Mangbetu people
- Mangla Dam
- Mango
- Mangonel
- Mangosteen
- Mangrove crab
- Mangrove
- Manhattan (1979 film)
- Manhattan Bridge
- Manhattan Project
- Manhattan
- Manhole
- Manhua
- Manhwa
- Mania
- Manichaeism
- Manicouagan Reservoir
- Manifest destiny
- Manifold
- Manihiki
- Manila
- Manilkara zapota
- Maniots
- Manipur
- Manisa
- Manitoba
- Manitou
- Manius Valerius Maximus Messalla
- Mankato, Minnesota
- Mankiala
- Manneken Pis
- Mannerism
- Mannheim
- Mannitol
- Manon Lescaut
- Manor house
- Manorial court
- Manot 1
- Manovo-Gounda St. Floris National Park
- Manresa
- Mansa Musa
- Mansfeld
- Mansfieldite
- Manslaughter
- Manson Family
- Mansoura, Egypt
- Manta ray
- Mantella
- Mantes-la-Jolie
- Manticore
- Mantis shrimp
- Mantis
- Mantispidae
- Mantle (geology)
- Mantle convection
- Mantle plume
- Mantophasmatidae
- Mantra
- Mantua
- Manucode
- Manuel Bretón de los Herreros
- Manuel de Aspiroz
- Manuel de Faria e Sousa
- Manuel Francisco Álvarez de la Peña
- Manuel García (tenor)
- Manuel Godoy
- Manuel I of Portugal
- Manuel I of Trebizond
- Manuel II of Trebizond
- Manuel Joël
- Manuel José Quintana
- Manuel Maria Barbosa du Bocage
- Manuel Milà i Fontanals
- Manuel Moschopoulos
- Manuel Pavía y Lacy
- Manuel Pavía y Rodríguez de Alburquerque
- Manuel Philes
- Manuel Ruiz Zorrilla
- Manuel Tamayo y Baus
- Manufacturing engineering
- Manufacturing
- Manure
- Manx cat
- Manx language
- Many-one reduction
- Many-worlds interpretation
- Manyema
- Manzini, Eswatini
- Mao Zedong
- Maoism
- Maoming
- Māori language
- Māori people
- Map projection
- Map
- Maple Leaf Rag
- Maple
- Mappila Muslims
- Mapuche
- Maputo Bay
- Maputo
- Mar del Plata
- Mara Clara
- Marabou stork
- Maracaibo
- Maracay
- Maradi, Niger
- Maragheh
- Marajó
- Marajoara culture
- Maranhão
- Marash
- Maratha (caste)
- Maratha Empire
- Marathi language
- Marattiaceae
- Maravi
- Marazion
- Marble
- Marburg Colloquy
- Marbury v. Madison
- Marc Girardin
- Marc Monnier
- Marc René, marquis de Montalembert
- Marc-Antoine Madeleine Désaugiers
- Marc-Théodore Bourrit
- Marcantonio Raimondi
- Marcel Alexandre Bertrand
- Marcel Prévost
- Marcelino Menéndez y Pelayo
- Marcellin Berthelot
- Marcellin Marbot
- Marcescence
- March (music)
- March (territory)
- March 1st Movement
- March equinox
- March of the Volunteers
- March of Tuscany
- March on Washington for Jobs and Freedom
- March
- Marcha Real
- Marchantiophyta
- Marchantiopsida
- Marche
- Marchena
- Marchfeld
- Marching band
- Marcian
- Marcionism
- Marco Antonio de Dominis
- Marco Minghetti
- Marco Polo
- Marcos de Niza
- Marcus Antistius Labeo
- Marcus Antonius (orator)
- Marcus Antonius Creticus
- Marcus Antonius Primus
- Marcus Atilius Regulus (consul 267 BC)
- Marcus Clarke
- Marcus Claudius Marcellus
- Marcus Cornelius Fronto
- Marcus Dods (theologian born 1834)
- Marcus Fulvius Nobilior (consul 189 BC)
- Marcus Furius Camillus
- Marcus Kalisch
- Marcus Lollius
- Marcus Manilius
- Marcus Musurus
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- Modified Mercalli intensity scale
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- Molecule
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- Moment (time)
- Moment magnitude scale
- Moment of inertia
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- Momentum operator
- Momentum
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- Mon people
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- Mona monkey
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- Monal
- Monarch butterfly
- Monarchianism
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- Monash University
- Monastery
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- Mönch
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- Monchique
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- Monday Night Football
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- Monetarism
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- Mong Nai
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- Mongol conquest of China
- Mongol Empire
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- Mongol invasion of Kievan Rus'
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- Mongol invasions and conquests
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- Mongolia
- Mongolian language
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- Mongolian script
- Mongols
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- Mongrel
- Monism
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- Monitor lizard
- Monk
- Monkey King
- Monkey
- Monluc
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- Monoammonium glutamate
- Monoceros
- Monochromacy
- Monoclinic crystal system
- Monocotyledon
- Monocrystalline whisker
- Monodrama
- Monolayer
- Monologue
- Monomer
- Monomial
- Mononoke
- Monopoli
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- Monopotassium glutamate
- Monopteros
- Monorail
- Monosaccharide
- Monosodium citrate
- Monosodium glutamate
- Monotheism
- Monotreme
- Monreale
- Monro
- Monroe Doctrine
- Monrose
- Monrovia
- Møns Klint
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- Monsoon
- Monster truck
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- Mont Blanc
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- Montana
- Montane ecosystems
- Montane grasslands and shrublands
- Montargis
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- Monte Carlo method
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- Montego Bay
- Montenegro
- Montepulciano
- Montería
- Monterrey
- Montesquieu
- Montessori education
- Montevideo
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- Montgomery bus boycott
- Montgomery, Alabama
- Month's mind
- Month
- Monthly Notices of the Royal Astronomical Society
- Montilla
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- Montpelier, Vermont
- Montpellier
- Montreal Metro
- Montreal Museum of Fine Arts
- Montreal
- Montserrat
- Monty Hall problem
- Monty Python's Flying Circus
- Monty Python's Life of Brian
- Monufia Governorate
- Monument Valley
- Monument
- Monumental brass
- Monywa
- Monza
- Monzonite
- Mood (psychology)
- Mood disorder
- Moodkee
- Moomins
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- Moonlight Mask
- Moonrat
- Moonrise and moonset
- Moonrise, Hernandez, New Mexico
- Moons of Haumea
- Moons of Jupiter
- Moons of Mars
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- Moons of Pluto
- Moons of Saturn
- Moons of Uranus
- Moore's law
- Mooré
- Moorhen
- Moorish architecture
- Moorish idol
- Moorland
- Moors murders
- Moors
- Moose
- Moped
- Mór Jókai
- Moraceae
- Moradabad
- Moraine
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- Moral psychology
- Moral relativism
- Moral rights
- Morality and religion
- Morality
- Morar
- Moratalla, Murcia
- Moratuwa
- Morava (river)
- Moravia
- Moravian Church
- Moravian-Silesian Region
- Moray eel
- Morbi
- Morcar
- Morchella esculenta
- Mordechai ben Hillel
- Mordovia
- Mordvins
- Morelia
- Morell Mackenzie
- Morelos
- Moretto da Brescia
- Morgan Lewis Smith
- Morgen
- Morioka
- Moriori genocide
- Morisco
- Moritz August von Thümmel
- Moritz Hartmann
- Moritz Hauptmann
- Moritz Hoernes
- Moritz Lazarus
- Moritz Moszkowski
- Moritz Steinschneider
- Moritz von Schwind
- Moritz von Strachwitz
- Moriz Carrière
- Moriz Haupt
- Morlaix
- Mormonism
- Mormyridae
- Mormyrinae
- Morning Edition
- Morning
- Moro Islamic Liberation Front
- Moro people
- Moroccan Arabic
- Morocco
- Morogoro
- Morón de la Frontera
- Moroni, Comoros
- Morosini
- Morpheme
- Morphine
- Morphism
- Morpho
- Morphology (biology)
- Morphology (linguistics)
- Morphophonology
- Morray
- Morris dance
- Morris Ketchum Jesup
- Morris the Cat
- Morse code
- Morshansk
- Mortain
- Mortal sin
- Mortar (masonry)
- Mortar (weapon)
- Mortara case
- Mortgage loan
- Mortimer Collins
- Mortimer Sackville-West, 1st Baron Sackville
- Mortimer
- Mortmain
- Morto da Feltre
- Morula
- Moruroa
- Morus (plant)
- Morvan
- Mosaic
- Mosasaur
- Mosasaurus
- Moschops
- Moschus
- Moscovium
- Moscow Basin
- Moscow Canal
- Moscow Metro
- Moscow Museum of Modern Art
- Moscow State University
- Moscow theater hostage crisis
- Moscow
- Moselle-Line
- Moselle
- Moses (Michelangelo)
- Moses Amyraut
- Moses Coit Tyler
- Moses de León
- Moses Isserles
- Moses Stuart
- Moses Wilhelm Shapira
- Moses
- MOSFET
- Moshe Alshich
- Moshe Chaim Luzzatto
- Moshi, Tanzania
- Moskenesøya
- Moskva (river)
- Mosque–Cathedral of Córdoba
- Mosque
- Mosquito Coast
- Mosquito-borne disease
- Mosquito
- Moss agate
- Moss
- Mossad
- Mossi Kingdoms
- Móstoles
- Mosul
- Motacillidae
- Motel
- Moth
- Mother goddess
- Mother Goose
- Mother India
- Mother Jones (magazine)
- Mother Teresa
- Mother's Day
- Motherboard
- Mothman
- Motif (music)
- Motif (narrative)
- Motility
- Motion (legal)
- Motion sickness
- Motion
- Motivation
- Motmot
- Motobu Peninsula
- Motor ship
- Motor vehicle
- Motorboat
- Motorcycle club
- Motorcycle taxi
- Motorcycle
- Motorized scooter
- Motril
- Mottama
- Motte-and-bailey castle
- Motya
- Moulin Quignon
- Moulting
- Moundou
- Mount Adams (Washington)
- Mount Algidus
- Mount Aragats
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- Mount Emei
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- Mount Etna
- Mount Everest
- Mount Fairweather
- Mount Fuji
- Mount Graham
- Mount Heng (Hunan)
- Mount Heng (Shanxi)
- Mount Hood
- Mount Hor
- Mount Hotakadake
- Mount Hua
- Mount Jiuhua
- Mount Kailash
- Mount Kazbek
- Mount Kenya
- Mount Kilimanjaro
- Mount Kita
- Mount Kosciuszko
- Mount Logan
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- Mount Shasta
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- Mount Stanley
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- Mount Washington
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- Mount Wilson Observatory
- Mount Wutai
- Mountague Bernard
- Mountain bike
- Mountain goat
- Mountain gorilla
- Mountain pass
- Mountain range
- Mountain states
- Mountain zebra
- Mountain
- Mountaineering
- Mountaintop removal mining
- Mountstuart Elphinstone
- Mourning dove
- Mouse
- Mousebird
- Mouth-to-mouth resuscitation
- Mouth
- Mouthwash
- Movable type
- Movie theater
- Mowgli
- Mozabite people
- Mozambican Civil War
- Mozambican War of Independence
- Mozambique Channel
- Mozambique
- Mozarabic art and architecture
- Mozarabic Rite
- MP3
- MPEG-4
- Mpumalanga
- Mr and Mrs Andrews
- Mr. Bean
- Mr. Smith Goes to Washington
- Mrs Dalloway
- Mrs Markham
- Mrs Patrick Campbell
- MS-13
- MS-DOS
- Ms. (magazine)
- MSN
- MSX
- MTR
- Mtsensk
- MTV Movie & TV Awards
- MTV
- Mu'allaqat
- Mucic acid
- Muckers
- Mucuna
- Mud dauber
- Mud
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- Mudanya
- Mudcrack
- Mudéjar architecture of Aragon
- Mudflat
- Mudhol
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- Muezzin
- Mufaddaliyat
- Mugger crocodile
- Mughal architecture
- Mughal Empire
- Mughal painting
- Mughal-e-Azam
- Mughal–Maratha Wars
- Mugwort
- Muhammad Ahmad
- Muhammad al-Amin al-Kanemi
- Muhammad Ali dynasty
- Muhammad Ali Pasha
- Muhammad ibn Musa al-Khwarizmi
- Muhammad XI of Granada
- Muhammad XII of Granada
- Muhammad's wives
- Muhammad
- Muharraq Island
- Mühlhausen
- Muhteşem Yüzyıl
- Muisca Confederation
- Mujahideen
- Mukden Incident
- Mukhtar al-Kunti
- Mula sa Puso
- Mulch
- Muldrow Glacier
- Mule
- Mülheim, Cologne
- Mülheim
- Mulholland Drive (film)
- Mulhouse
- Mullet (fish)
- Mullion
- Multan
- Multatuli
- Multi-booting
- Multi-commodity flow problem
- Multi-core processor
- Multi-exposure HDR capture
- Multi-factor authentication
- Multi-ringed basin
- Multibody system
- Multiculturalism
- Multiferroics
- Multigraph
- Multihull
- Multilayer switch
- Multilevel streets in Chicago
- Multilingualism
- Multimedia
- MultiMediaCard
- Multimeter
- Multinational corporation
- Multiple (mathematics)
- Multiple birth
- Multiple cropping
- Multiple integral
- Multiple rocket launcher
- Multiple sclerosis
- Multiple-barrel firearm
- Multiple-vortex tornado
- Multiplepoinding
- Multiplexing
- Multiplication sign
- Multiplication table
- Multiplication
- Multiplicative function
- Multiplicative inverse
- Multipole expansion
- Multiprocessing
- Multiracial people
- Multirole combat aircraft
- Multiset
- Multithreading (computer architecture)
- Multituberculata
- Multivalued function
- Multivariable calculus
- Multiverse
- Multnomah Falls
- Mumbai Metro
- Mumbai
- Mummy
- Mumps
- Munda people
- Munduruku
- Munejjim-bashi Ahmed Dede
- Mung bean
- Munger
- Mungo Park (explorer)
- Munich Agreement
- Munich U-Bahn
- Munich
- Municipal Borough of Southall
- Municipal charter
- Municipality
- Muniment
- Munster
- Münster
- Muntinlupa
- Muntjac
- Munzinger
- Muon neutrino
- Muon
- Muonio (river)
- Muqaddimah
- Murad
- Muraena
- Mural
- Murasaki Shikibu
- Murcia
- Murder of George Floyd
- Murder on the Orient Express
- Murder
- Murders of Chaney, Goodman, and Schwerner
- Muretus
- Murexide
- Muri Abbey
- Muri, Taraba State
- Muricidae
- Muridae
- Murji'ah
- Murmansk
- Muromachi period
- Murphysboro, Illinois
- Murray cod
- Murray River
- Murrumbidgee River
- Murujuga
- Mus'art Gallery
- Musa of Parthia
- Musca
- Muscat
- Muschelkalk
- Muscle & Nerve
- Muscle car
- Muscle cell
- Muscle contraction
- Muscle tissue
- Muscogee
- Muscovite–Lithuanian Wars
- Muscovite
- Muscovy duck
- Muscular system
- Musée d'Orsay
- Musée de l'Amérique francophone
- Musée des Arts et Métiers
- Musée National d'Art Moderne
- Museo Barracco di Scultura Antica
- Museo de Arte Moderno
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- Museo Nacional de Arte
- Museo Nacional de Bellas Artes (Buenos Aires)
- Museo Rufino Tamayo, Mexico City
- Museo Soumaya
- Museology
- Muses
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- Museum Boijmans Van Beuningen
- Museum of Fine Arts (Budapest)
- Museum of Fine Arts, Boston
- Museum of Islamic Art, Doha
- Museum of Mexico City
- Museum of Modern Art
- Museum of Science and Industry (Chicago)
- Museum
- Musgrave Ranges
- Mushahada
- Mushroom poisoning
- Mushroom
- Music box
- Music education
- Music festival
- Music genre
- Music hall
- Music in advertising
- Music industry
- Music magazine
- Music of Africa
- Music of Argentina
- Music of Australia
- Music of Austria
- Music of Brazil
- Music of Canada
- Music of China
- Music of Cuba
- Music of Egypt
- Music of Ethiopia
- Music of France
- Music of Germany
- Music of Hawaii
- Music of India
- Music of Indonesia
- Music of Iran
- Music of Italy
- Music of Japan
- Music of Korea
- Music of Latin America
- Music of Mexico
- Music of Mozambique
- Music of Nigeria
- Music of Poland
- Music of Polynesia
- Music of Russia
- Music of South Africa
- Music of Spain
- Music of Star Wars
- Music of Sudan
- Music of Thailand
- Music of the Democratic Republic of the Congo
- Music of The Lord of the Rings film series
- Music of the Netherlands
- Music of the United Kingdom
- Music of the United States
- Music of Turkey
- Music of Vietnam
- Music psychology
- Music radio
- Music school
- Music sequencer
- Music theory
- Music venue
- Music video
- Music
- Musical composition
- Musical ensemble
- Musical film
- Musical form
- Musical improvisation
- Musical instrument
- Musical notation
- Musical theatre
- Musical tuning
- Musician
- Musicology
- Musikverein
- Musique concrète
- Musk deer
- Muskellunge
- Musket Wars
- Musket
- Muskox
- Muskrat
- Muskroot
- Muslim Brotherhood
- Muslim conquest of Egypt
- Muslim conquest of Persia
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- Nesle
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- Neyriz
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- NGC 1275
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- Nickel
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- Nicobar Islands
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- Nicola Fabrizi
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- Nicomachean Ethics
- Nicomachus of Thebes
- Nicomedes I of Bithynia
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- Nicomedes III of Bithynia
- Nicomedia
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- Nicosia
- Nicotine
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- Niederselters
- Niello
- Niels Juel
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- Nienburg, Lower Saxony
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- Nierstein
- Nifurtimox/eflornithine
- Niğde
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- Niger–Congo languages
- Niger
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- Nigerian Dwarf goat
- Nigerian naira
- Night (book)
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- Night of the Living Dead
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- Night on Bald Mountain
- Night school
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- Night-vision device
- Night
- Nightclub
- Nighthawks (Hopper)
- Nightjar
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- Nigidius Figulus
- Nihilism
- Nihonium
- Niigata (city)
- Niigata Prefecture
- Niihau
- Níjar
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- Nike, Inc.
- Nikephoros I of Constantinople
- Nikephoros I
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- Niketas Choniates
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- Nikola Tesla
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- Nikolai Rezanov
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- Nikolay Karamzin
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- Nikolay Przhevalsky
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- Nile crocodile
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- Nîmes
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- Nineteenth-century theatre
- Ninety-five Theses
- Nineveh
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- Ninja
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- Nintendo
- Ninth generation of video game consoles
- Niobium
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- Nirvana
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- Nitric oxide
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- Nitrite
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- Nitrocellulose
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- Nitrogen dioxide
- Nitrogen fixation
- Nitrogen trifluoride
- Nitrogen
- Nitroglycerin
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- Nitrous oxide
- Niue
- Nivelle offensive
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- NME
- No Woman, No Cry
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- No. 5, 1948
- No. 6 (Violet, Green and Red)
- Noah Porter
- Noah
- Noakhali District
- Nobel Prize
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- Nocera Inferiore
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- Noctilucales
- Noctilucent cloud
- Noctuidae
- Nocturne in Black and Gold – The Falling Rocket
- Nocturne
- Nocturnes (Chopin)
- Node (networking)
- Node (physics)
- Nodosauridae
- Noël Alexandre
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- Noël François de Wailly
- Noël-Nicolas Coypel
- Noether's theorem
- Noetus
- Nogi Maresuke
- Nógrád County
- Noh
- Noida
- Noirmoutier
- Noise (electronics)
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- Nok culture
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- Noli
- Nomad
- Nomenclature codes
- Nominalization
- Nominoe
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- Non-Aligned Movement
- Non-cellular life
- Non-coding DNA
- Non-coding RNA
- Non-commissioned officer
- Non-equilibrium thermodynamics
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- Non-lethal weapon
- Non-Newtonian fluid
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- Non-stoichiometric compound
- Non-suit
- Non-Violence (sculpture)
- Non-volatile memory
- Nonchord tone
- Nonconformist (Protestantism)
- Nondeterministic Turing machine
- Nondualism
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- Nonius Marcellus
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- Nonmetal
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- Nonthaburi
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- Noon
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- Only Fools and Horses
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- Operetta
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- Ophanim
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- Orbetello
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- Orbit
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- Orbital elements
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- Orca
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- Organization
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- Organochlorine compound
- Organometallic chemistry
- Organon
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- Organosilicon compound
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- Origami
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- Orlando, Florida
- Orlando: A Biography
- Orléanais
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- Ormolu
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- Ornithischia
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- Orodes II
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- Orogeny
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- Orthogonal frequency-division multiplexing
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- Ortigueira
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- Oryza
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- Oslo
- Osmium tetroxide
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- Osteichthyes
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- Osteoarthritis
- Osteoglossiformes
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- Oxidative phosphorylation
- Oxide mineral
- Oxide
- Oxidizing agent
- Oxime
- Oxonium ion
- Oxpecker
- Oxyanion
- Oxycodone
- Oxygen cycle
- Oxygen difluoride
- Oxygen
- Oxyhydrogen
- Oxytocin
- Ōyama Iwao
- Oyer and terminer
- Oyo Empire
- Oyo State
- Oyo, Oyo State
- Oyster
- Oystercatcher
- Oystermouth
- Ozarks
- Ozias Humphry
- Ozokerite
- Ozone depletion
- Ozone layer
- Ozone
- Ozymandias
- P (complexity)
- P versus NP problem
- P wave
- P-value
- P–n diode
- P. T. Barnum
- P. T. Forsyth
- PA Media
- Pablo de Sarasate
- Pablo Picasso
- Pabna
- Pachamama
- Pachelbel's Canon
- Pachycephalosauria
- Pachycephalosaurus
- Pachypasa
- Pachyrhinosaurus
- Pacific blockade
- Pacific bluefin tuna
- Pacific Coast Ranges
- Pacific Islands Forum
- Pacific Northwest
- Pacific Ocean
- Pacific Plate
- Pacific saury
- Pacific temperate rainforests
- Pacific War
- Pacific-Antarctic Ridge
- Pacifism
- Pack rat
- Pacorus I
- Pacorus II
- Pacuvius
- Padang
- Padding
- Paddle steamer
- Paddlefish
- Paddy field
- Pademelon
- Padma River
- Padua
- Paektu Mountain
- Paeligni
- Paeonia (kingdom)
- Pafnuty Chebyshev
- Pagan Kingdom
- Paganism
- Page (computer memory)
- Page orientation
- Page printer
- Pago Pago
- Pagoda
- Pagodite
- Pahang
- Pahlavi dynasty
- Pain
- Painesville, Ohio
- Paint
- Painted Desert (Arizona)
- Painted turtle
- Painting
- Pair production
- Pair-instability supernova
- Paita
- Paju
- Pakdasht
- Pakington
- Pakistan
- Pakokku
- Pakse
- Pal (dog)
- Pál Teleki
- PAL
- Pala Empire
- Palace Museum
- Palace of Versailles
- Palace of Westminster
- Palace
- Palaemon serratus
- Palaeognathae
- Palaeography
- Palaeoisopus
- Palaeontology (journal)
- Palaeospondylus
- Palaeotherium
- Palaephatus
- Palakkad
- Palamu district
- Palangka Raya
- Palanpur
- Palashi
- Palau
- Palawan (island)
- Palayamkottai
- Palazzo dei Normanni
- Palazzo Pitti
- Palazzolo Acreide
- Pale Blue Dot
- Pale Fire
- Palembang
- Paleo-Indians
- Paleo-Tethys Ocean
- Paleoanthropology
- Paleobotany
- Paleocene–Eocene Thermal Maximum
- Paleocene
- Paleoclimatology
- Paleocontinent
- Paleoecology
- Paleogene
- Paleohydrology
- Paleolithic Europe
- Paleolithic religion
- Paleolithic
- Paleomagnetism
- Paleontology
- Paleoproterozoic
- Paleosol
- Paleotempestology
- Paleothermometer
- Paleozoic
- Palermo
- Palestine (region)
- Palestrina
- Palette (computing)
- Paley Center for Media
- Pali Canon
- Pali
- Palikir
- Palingenesis
- Palisade
- Palitana
- Paliurus spina-christi
- Palk Strait
- Palla
- Palladian architecture
- Palladium
- Pallas's cat
- Pallava dynasty
- Pallavaram
- Palliative care
- Pallium
- Pallone
- Palm (unit)
- Palm Islands
- Palm Springs, California
- Palm Sunday
- Palma de Mallorca
- Palma Vecchio
- Palmaria palmata
- Palmas, Tocantins
- Palme d'Or
- Palmette
- Palmyra
- Palmyrene Aramaic
- Palpigradi
- Palti, son of Laish
- Palu
- Palwal
- Pamiers
- Pamir Mountains
- Pamlico Sound
- Pampas
- Pamphilus of Alexandria
- Pamphlet
- Pamphylia
- Pamplona
- Pamukkale
- Pan (genus)
- Pan Am Flight 103
- Pan Am
- Pan flute
- Pan-Africanism
- Pan-American Conference
- Pan-nationalism
- Pan-Slavism
- Pan's Labyrinth
- Panache
- Panaenus
- Panaetius
- Panaji
- Panama Canal
- Panama City
- Panama
- Panasonic
- Panavia Tornado
- Panay
- Pañcāla
- Panchatantra
- Panchmahal district
- Pancreas
- Pancreatic cancer
- Pandalus borealis
- Pandanaceae
- Pandanus
- Pandeism
- Pandemic
- Pandharpur
- Pandora's box
- Pandura
- Pandya dynasty
- Panegyric
- Panentheism
- Paneth cell
- Pangaea
- Pangako Sa 'Yo
- Pangolin
- Panic of 1819
- Panic of 1873
- Panic of 1893
- Panic of 1907
- Panic
- Panihati
- Panjdeh incident
- Panjin
- Pannage
- Pannonian Avars
- Pannotia
- Panoply
- Panoramic painting
- Pantaenus
- Pantanal
- Pantechnicon van
- Pantelleria
- Panthalassa
- Pantheism
- Pantheon, Rome
- Panthera hybrid
- Panthera spelaea
- Panthera
- Pantodonta
- Pantograph
- Pantomime
- Pantón
- Pantothenic acid
- Panyassis
- Panzhihua
- Paolo Emiliani Giudici
- Paolo Farinati
- Paolo Frisi
- Paolo Giacometti
- Paolo Mantegazza
- Paolo Paruta
- Paolo Sarpi
- Paolo Savi
- Paolo Veronese
- Pap test
- Papahānaumokuākea Marine National Monument
- Papal States
- Papaver somniferum
- Papaya
- Papeda (citrus)
- Papeete
- Papenburg
- Paper bag
- Paper craft
- Paper cup
- Paper towel
- Paper
- Papermaking
- Paphlagonia
- Paphos
- Papier-mâché
- Papinian
- Pappus of Alexandria
- Papua (province)
- Papua New Guinea
- Papuan Peninsula
- Papyrus
- Pará
- Parable of the Good Samaritan
- Parable
- Parabola
- Parabolic partial differential equation
- Paracanthurus
- Paracel Islands
- Paraceratherium
- Paracetamol
- Parachute
- Parade de cirque
- Paradigm
- Paradiplomacy
- Paradise Lost
- Paradise
- Paradox
- Paradoxurus
- Paraffin wax
- Paraguay River
- Paraguay
- Paraguayan War
- Parahyangan
- Paraíba do Sul
- Paraíba
- Parakeet
- Paralakhemundi
- Paralanguage
- Paraldehyde
- Paralegal
- Parallax
- Parallel (geometry)
- Parallel ATA
- Parallel communication
- Parallel computing
- Parallel Lives
- Parallelogram
- Paramagnetism
- Paramara dynasty
- Paramaribo
- Paramecium
- Paramedic
- Parament
- Parameter (computer programming)
- Parametric equation
- Parametric statistics
- Pāramitā
- Paraná (state)
- Paraná River
- Paranaguá
- Parañaque
- Paranoid (album)
- Paranoid fiction
- Paranoid personality disorder
- Paranthropus aethiopicus
- Paranthropus boisei
- Paranthropus robustus
- Paranthropus
- Parapet
- Paraphernalia
- Parapsychology
- Parareptilia
- Parasaurolophus
- Parasequence
- Parashah
- Parasitic disease
- Parasitism
- Parasitoid wasp
- Parasnath
- Parasympathetic nervous system
- Paratransit
- Parbhani
- Parchim
- Parchment
- Parclose screen
- Pardaillan
- Pardes (exegesis)
- Pardubice Region
- Pardubice
- Pareiasaur
- Parent hydride
- Parent–teacher conference
- Parental leave
- Parenting
- Parga
- Pargeting
- Parian Chronicle
- Parícutin
- Parietal lobe
- Paris Agreement
- Paris Bordone
- Paris Charter
- Paris Club
- Paris Commune
- Paris meridian
- Paris Métro
- Paris Street; Rainy Day
- Paris
- Parish (administrative division)
- Parisite-(Ce)
- Parity (mathematics)
- Parity (physics)
- Parity bit
- Park and ride
- Park
- Parking lot
- Parking
- Parkinson (TV series)
- Parkinson's disease
- Parlement
- Parliament Hill
- Parliament House, Canberra
- Parliament of the United Kingdom
- Parliament of the World's Religions
- Parliament
- Parliamentary procedure
- Parma
- Parmenides
- Parmenion
- Parmesan
- Parnaíba
- Parnassia
- Parnassus plays
- Parnon
- Parochial school
- Parodos
- Parody music
- Parody religion
- Parody
- Parole
- Paroo River
- Paros
- Parrot
- Parrotfish
- Parsec
- Parsifal bell
- Parsifal
- Parsis
- Parsley
- Parsnip
- Parson
- Part of speech
- Parthenay
- Parthenogenesis
- Parthenon
- Parthenopean Republic
- Parthian Empire
- Partial derivative
- Partial differential equation
- Partial function
- Partial melting
- Partial permutation
- Partial pressure
- Partially ordered set
- Particle accelerator
- Particle decay
- Particle detector
- Particle horizon
- Particle in a box
- Particle in a spherically symmetric potential
- Particle number
- Particle physics
- Particle statistics
- Particle
- Partisan (weapon)
- Partita for Violin No. 2 (Bach)
- Partition (number theory)
- Partition (politics)
- Partition function (statistical mechanics)
- Partition of a set
- Partition of India
- Partition of Jin
- Partition of the Ottoman Empire
- Partitions of Poland
- Partners (statue)
- Partnership
- Partonopeus de Blois
- Partridge
- Parts-per notation
- Party wall
- Party-directed mediation
- Parvati
- Parvise
- Parysatis
- Parzival
- Pasay
- Pascal (programming language)
- Pascal (unit)
- Pascal's triangle
- Pascual Cervera y Topete
- Pascual Madoz
- Pasewalk
- Pasha
- Pashto
- Pasig
- Pasiteles
- Pasodoble
- Paspalum dilatatum
- Pasquale Galluppi
- Pasquale Paoli
- Pasquale Stanislao Mancini
- Pasquier Quesnel
- Pasquinade
- Passacaglia and Fugue in C minor, BWV 582
- Passenger pigeon
- Passenger ship
- Passenger terminal (maritime)
- Passenger train
- Passenger
- Passerine
- Passes of the Silvretta and Rätikon Ranges
- Passiflora edulis
- Passiflora quadrangularis
- Passiflora
- Passion (emotion)
- Passions
- Passive cooling
- Passive margin
- Passive transport
- Passive–aggressive personality disorder
- Passover
- Passport
- Password
- Past sea level
- Pastel
- Pasteurization
- Pasticcio
- Pasto, Colombia
- Paston Letters
- Pastoral epistles
- Pastoral farming
- Pastoral letter
- Pastoralism
- Pasture
- Patagonia
- Patagonian Desert
- Patch (computing)
- Patella
- Paten
- Patent infringement
- Patent of precedence
- Patent office
- Patent
- Patentability
- Paterinata
- Path (graph theory)
- PATH (variable)
- Path integral formulation
- Pathet Lao
- Pathogen transmission
- Pathogen
- Pathogenic bacteria
- Pathogenic Escherichia coli
- Pathology
- Paths of Glory
- Patiala
- Patio
- Patna
- Patras
- Patriarch Filaret of Moscow
- Patriarch Nikon of Moscow
- Patricio Lynch
- Patrick Abercromby
- Patrick Adamson
- Patrick Duigenan
- Patrick Fraser Tytler
- Patrick Gilmore
- Patrick Gordon
- Patrick Hamilton (martyr)
- Patrick Ruthven, 1st Earl of Forth
- Patrick Ruthven, 3rd Lord Ruthven
- Patrilineality
- Patriot Act
- Patriotism
- Patrol
- Patronage in ancient Rome
- Patroon painters
- Pattaya
- Patter
- Pattern formation
- Pattern hair loss
- Paul Adolphe Marie Prosper Granier de Cassagnac
- Paul Amman
- Paul Armand Silvestre
- Paul Barras
- Paul Bernays
- Paul Bert
- Paul Bins, comte de Saint-Victor
- Paul Bourget
- Paul Bril
- Paul Bronsart von Schellendorff
- Paul Bunyan
- Paul Cambon
- Paul Cullen (cardinal)
- Paul de Foix
- Paul de Lagarde
- Paul de Rapin
- Paul de Vigne
- Paul Delaroche
- Paul Déroulède
- Paul Deschanel
- Paul Du Chaillu
- Paul Eber
- Paul Erman
- Paul Falconer Poole
- Paul Ferrier
- Paul Féval, père
- Paul Gavarni
- Paul Gervais
- Paul Heinrich von Groth
- Paul Hervieu
- Paul Hinschius
- Paul I of Russia
- Paul Jean Clays
- Paul Johann Anselm Ritter von Feuerbach
- Paul Joseph Barthez
- Paul Kray
- Paul Lacroix
- Paul Laurentius
- Paul Lindau
- Paul Louis Courier
- Paul Margueritte
- Paul Meurice
- Paul Meyer (philologist)
- Paul Morin
- Paul Morphy
- Paul of Aegina
- Paul of Samosata
- Paul Reuter
- Paul Sabatier (theologian)
- Paul Schützenberger
- Paul the Apostle
- Paul the Deacon
- Paul Vinogradoff
- Paul Viollet
- Paul W. Litchfield
- Paul Wayland Bartlett
- Paul Wentworth
- Paul-Albert Besnard
- Paul-Armand Challemel-Lacour
- Paul-Jacques-Aimé Baudry
- Paulet
- Pauli exclusion principle
- Pauline Marie Armande Craven
- Paulus Aemilius Veronensis
- Paulus Castrensis
- Pauperism
- Pauropoda
- Pausanias (geographer)
- Pausias
- Pavane (Fauré)
- Pavel Jozef Šafárik
- Pavel Yablochkov
- Pavilion
- Pavise
- Pavlodar
- Pavlovo
- Pavlovsky Posad
- Pavo (constellation)
- Pax Mongolica
- Pax Romana
- Pax Sinica
- Paxo
- Payment of members
- Payment
- PayPal
- Pays de la Loire
- Pazardzhik
- PBS
- PC Card
- PC Gamer
- PC-9800 series
- PCI Express
- Pea
- Peabody Awards
- Peace and Truce of God
- Peace Corps
- Peace of Augsburg
- Peace of Ryswick
- Peace of Westphalia
- Peace River
- Peace
- Peacekeeping
- Peach
- Peafowl
- Peak demand
- Peak Pobeda (Sakha)
- Peano axioms
- Peanut Hole
- Peanut
- Peanuts
- Pear
- Pearl River Delta
- Pearl River
- Pearl
- Pearlfish
- Peasant
- Peasants' Revolt
- Peat
- Pebble
- Pebibit
- Pecan
- Peccary
- Pechenegs
- Pechora (river)
- Pechora
- Peck
- Pecora
- Pecos River
- Pecten maximus
- Pectin
- Peculiar galaxy
- Peculiar People
- Pedagogy
- Pedals (bear)
- Pedant
- Peder Griffenfeld
- Peder Oxe
- Peder Skram
- Pedestal
- Pedestrian crossing
- Pedestrian zone
- Pediatrics
- Pedology
- Pedophilia
- Pedosphere
- Pedro Antonio de Alarcón
- Pedro Correia Garção
- Pedro de Mena
- Pedro de Ribadeneira
- Pedro González de Mendoza
- Pedro Navarro
- Pedro Nunes
- Pedro Pablo Abarca de Bolea, 10th Count of Aranda
- Pedro Páramo
- Pedro Rodríguez, Count of Campomanes
- Pedro Téllez-Girón, 3rd Duke of Osuna
- Peep o' Day Boys
- Peer Gynt (Grieg)
- Peer pressure
- Peer review
- Peer-to-peer file sharing
- Peg Woffington
- Pegasus (constellation)
- Pegasus
- Pegau
- Peggy Eaton
- Pegu Range
- Pehr Henrik Ling
- Peine
- Peisander
- Pekalongan
- Pekanbaru
- Peking Man
- Peking opera
- Peking University
- Pekingese
- Pelagia
- Pelagic fish
- Pelagic red clay
- Pelagic sediment
- Pelagornis
- Pelagornithidae
- Pelatiah Webster
- Pele (deity)
- Pelé
- Pelican eel
- Pelican
- Pelisse
- Pella
- Pellaea (plant)
- Pellegrino Rossi
- Pelletizing
- Pelopidas
- Peloponnesian League
- Peloponnesian War
- Pelorovis
- Peltigera canina
- Peltuinum
- Pelvis
- Pelycosaur
- Pembroke Welsh Corgi
- PEN International
- Pen
- Penaeus monodon
- Penal labour
- Penang Island
- Penang
- Penanggalan
- Pencil fish
- Pencil sharpener
- Pencil
- Pend d'Oreilles
- Pendant group
- Penduline tit
- Pendulum clock
- Pendulum
- Peneda-Gerês National Park
- Penelope Blount, Countess of Devonshire
- Penetrance
- Penetrating trauma
- Penetrator (aircraft)
- Penghu 1
- Penghu
- Pengjia Islet
- Penguin
- Penicillin
- Penicillium
- Penile cancer
- Peninsula
- Peninsular Arabic
- Peninsular War
- Penis
- Peniscola
- Penitential
- Penki
- Penmanship
- Penmarch
- Penn Yan, New York
- Penna River
- Penne
- Pennine Alps
- Pennines
- Pennsylvania Dutch language
- Pennsylvania Railroad
- Pennsylvania State University
- Pennsylvania
- Penny-farthing
- Penny
- Pennyweight
- Penology
- Pensées
- Pension fund
- Pension
- Pensionary
- Penstemon
- Pentacrinoidea
- Pentagon
- Pentaprism
- Pentaquark
- Pentastomida
- Pentatomoidea
- Pentecost
- Pentecostalism
- Penthouse (magazine)
- Peony
- People (magazine)
- People Are Funny
- People for the Ethical Treatment of Animals
- People Power Revolution
- People's Daily
- People's Liberation Army Daily
- People
- Pepe the Frog
- Peperino
- Pepoli
- Peppa Pig
- Pepper No. 30
- Pepper spray
- Pepper tree
- Peppered moth
- Peppermint
- PepsiCo
- Peptide
- Peptidoglycan
- Per Brahe the Younger
- Perak
- Peramelemorphia
- Peranakan Museum
- Percé Rock
- Percent sign
- Percentage
- Perception
- Perch
- Perche
- Perchlorate
- Perchloric acid
- Perchta
- Perciformes
- Percivall Pott
- Percussion cap
- Percussion instrument
- Percy Kirke
- Percy Smythe, 8th Viscount Strangford
- Perdiccas
- Père David's deer
- Père Goriot
- Peregrine falcon
- Peregrinus Proteus
- Pereira, Colombia
- Perennial philosophy
- Perentie
- Peretz Smolenskin
- Perfect competition
- Perfect information
- Perfect matching
- Perfect number
- Perfection
- Performance art
- Performance poetry
- Performance
- Performing arts medicine
- Performing arts
- Pergamon Museum
- Pergamon
- Pergola
- Peri-peri
- Pericallis × hybrida
- Periclase
- Pericles, Prince of Tyre
- Pericyclic reaction
- Peridot
- Peridotite
- Perim
- Perimeter
- Perino del Vaga
- Period (periodic table)
- Period 1 element
- Period 2 element
- Period 3 element
- Period 4 element
- Period 5 element
- Period 6 element
- Period 7 element
- Periodic function
- Periodic table
- Periodic trends
- Periodical cicadas
- Periodical literature
- Periodization
- Periodontal disease
- Peripheral artery disease
- Peripheral Component Interconnect
- Peripheral nervous system
- Peripheral
- Periphyton
- Peripteros
- Periscope
- Peristyle
- Peritoneum
- Perizonius
- Perjury
- Perl
- Perleberg
- Perm (unit)
- Perm, Russia
- Permaculture
- Permafrost
- Permanent Representatives' Committee of the African Union
- Permanganate
- Permeability (electromagnetism)
- Permeameter
- Permian–Triassic extinction event
- Permian
- Permittivity
- Permutation
- Pernambuco
- Pêro da Covilhã
- Pero López de Ayala
- Perognathinae
- Peroxide
- Peroxisome
- Peroz I
- Perpend stone
- Perpendicular Gothic
- Perpendicular
- Perpetual motion
- Perpetual war
- Perpetuum mobile
- Perpignan
- Perry Expedition
- Persepolis
- Perseus (constellation)
- Perseus Arm
- Perseus Cluster
- Perseus
- Perseverance (rover)
- Persian alphabet
- Persian art
- Persian carpet
- Persian cat
- Persian Constitutional Revolution
- Persian gardens
- Persian Gulf
- Persian Iraq
- Persian language
- Persian literature
- Persian miniature
- Persian mythology
- Persian traditional music
- Persimmon
- Persistent vegetative state
- Persius
- Persona (1966 film)
- Personal computer
- Personal grooming
- Personal name
- Personal NetWare
- Personal watercraft
- Personality disorder
- Personality psychology
- Personality test
- Personality
- Personation
- Perspective (graphical)
- Perspiration
- Persuasion (novel)
- Perth
- Perturbation theory
- Peru
- Perugia
- Peruvian War of Independence
- Pervigilium Veneris
- Pesaro
- Pescara
- Pescennius Niger
- Peschiera del Garda
- Pescia
- Peshawar
- Peshitta
- Pessinus
- Pest (organism)
- Pest County
- Pesticide
- Pet Sounds
- Petabit
- Petah Tikva
- Petal
- Petaling Jaya
- Petalism
- Peteinosaurus
- Peter Abelard
- Peter and the Wolf
- Peter and Wendy
- Peter Andreas Hansen
- Peter Annet
- Peter Anthony Motteux
- Peter Artedi
- Peter Bellinger Brodie
- Peter Benoit
- Peter Buchan
- Peter Christen Asbjørnsen
- Peter Cornelius
- Peter Courtenay
- Peter De Wint
- Peter Dens
- Peter des Roches
- Peter Elmsley
- Peter Gunning
- Peter I Island
- Peter II of Russia
- Peter Jan Beckx
- Peter King (British politician)
- Peter King, 1st Baron King
- Peter Kropotkin
- Peter Langtoft
- Peter le Page Renouf
- Peter Lesley
- Peter Martin Duncan
- Peter Mews
- Peter of Aigueblanche
- Peter of Castile
- Peter of Dusburg
- Peter Oluf Brøndsted
- Peter Pan
- Peter Paul Dobrée
- Peter Payne
- Péter Pázmány
- Peter Schrijver
- Peter Shafirov
- Peter Tait (physicist)
- Peter the Hermit
- Peter the Wild Boy
- Peter Tordenskjold
- Peter von Cornelius
- Peter Wentworth
- Peter Wilhelm Forchhammer
- Peter Winter
- Peter Wittgenstein
- Peterhof Palace
- Petersen graph
- Petit jury
- Petition
- Petits-Chevaux
- Petra
- Petralona Cave
- Petrified Forest National Park
- Petrified wood
- Petro Mohyla
- Petrochemical
- Petroglyph
- Petrol engine
- Petroleum coke
- Petroleum engineering
- Petroleum jelly
- Petroleum reservoir
- Petroleum
- Petrology
- Petronas Towers
- Petronel
- Petronius
- Petropavl
- Petropavlovsk-Kamchatsky
- Petrópolis
- Petrovaradin
- Petrozavodsk
- Petrus Aureolus
- Petrus Borel
- Petrus Hofman Peerlkamp
- Petrus Hofstede de Groot
- Petrus Peregrinus de Maricourt
- Petrus Ramus
- Petrus Scriverius
- Petrushka (ballet)
- Petter Dass
- Petticoat Junction
- Petty kingdoms of Norway
- Petty officer
- Petun
- Peugeot
- Pewter
- Pézenas
- Pfizer
- Pforta
- PH indicator
- PH
- Phaedo of Elis
- Phaedo
- Phaedrus (dialogue)
- Phaenias of Eresus
- Phage therapy
- Phalanger
- Phalangeriformes
- Phalangiotarbi
- Phalanx bone
- Phalanx
- Phalaris
- Phalarope
- Phallus
- Phalsbourg
- Phaltan
- Phan Thiết
- Phanariots
- Phanerozoic
- Phanocles
- Phantom island
- Phar Lap
- Pharaoh ant
- Pharaoh's daughter (Exodus)
- Pharaoh
- Phari
- Pharisees
- Pharmaceutical engineering
- Pharmacist
- Pharmacodynamics
- Pharmacogenomics
- Pharmacokinetics
- Pharmacology
- Pharmacosiderite
- Pharmacotherapy
- Pharmacy
- Pharming (genetics)
- Pharsalia
- Pharynx
- Phascogalini
- Phase (matter)
- Phase (waves)
- Phase curve (astronomy)
- Phase diagram
- Phase modulation
- Phase rule
- Phase separation
- Phase space
- Phase transition
- Phase velocity
- Phase-change Dual
- Phaseolus vulgaris
- Phasianidae
- Phasmatodea
- Pheasant
- Phèdre
- Pheidon
- Phélypeaux
- Phenacodus
- Phenakite
- Phenazine
- Phenazone
- Phencyclidine
- Phenol formaldehyde resin
- Phenol
- Phenolphthalein
- Phenomenology (philosophy)
- Phenomenon
- Phenotype
- Phenylalanine
- Phenylpropanoid
- Pherecrates
- Phidias
- Phigalia
- PHIGS
- Philadelphia Museum of Art
- Philadelphia
- Philae
- Philarète Chasles
- Philaretos
- Philately
- Philemon (biblical figure)
- Philibert de Gramont
- Philibert de l'Orme
- Philip Bourke Marston
- Philip Broke
- Philip Christoph von Königsmarck
- Philip Danforth Armour
- Philip de Koninck
- Philip de Montmorency, Count of Horn
- Philip Doddridge
- Philip Fruytiers
- Philip Howard Colomb
- Philip I of Castile
- Philip I, Landgrave of Hesse
- Philip II of Macedon
- Philip III of Spain
- Philip IV of Spain
- Philip James Bailey
- Philip James de Loutherbourg
- Philip Marlowe
- Philip Massinger
- Philip Meadows Taylor
- Philip of Swabia
- Philip Repyngdon
- Philip Schaff
- Philip Stanhope Worsley
- Philip Stanhope, 4th Earl of Chesterfield
- Philip Stubbs
- Philip the Evangelist
- Philip V of Macedon
- Philip Wilson Steer
- Philip Yorke, 1st Earl of Hardwicke
- Philip, Duke of Nemours
- Philipp Clüver
- Philipp Emanuel von Fellenberg
- Philipp Karl Buttmann
- Philipp Nicodemus Frischlin
- Philipp Spener
- Philipp van Limborch
- Philipp von Hutten
- Philippe Buchez
- Philippe de Chabot
- Philippe de Girard
- Philippe de Mézières
- Philippe de Mornay
- Philippe de Noailles
- Philippe de Rémi (died 1265)
- Philippe Desportes
- Philippe Emmanuel, Duke of Mercœur
- Philippe Henri, Comte de Grimoard
- Philippe Henri, marquis de Ségur
- Philippe I, Duke of Orléans
- Philippe II, Duke of Orléans
- Philippe Louis de Noailles
- Philippe Néricault Destouches
- Philippe Paul, comte de Ségur
- Philippe Quinault
- Philippe-Antoine Merlin de Douai
- Philippe-Auguste Hennequin
- Philippi
- Philippic
- Philippikos Bardanes
- Philippine drug war
- Philippine eagle
- Philippine Independent Church
- Philippine Revolution
- Philippine Sea Plate
- Philippine Sea
- Philippine–American War
- Philippines
- Philips of Marnix, Lord of Saint-Aldegonde
- Philips Wouwerman
- Philistines
- Phillaur
- Phillips Brooks
- Phillips curve
- Phillipsite
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- Philochorus
- Philoctetes (Sophocles play)
- Philodemus
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- Philolaus
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- Philopatris
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- Philosophiæ Naturalis Principia Mathematica
- Philosophical fiction
- Philosophical Investigations
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- Philosophical Transactions of the Royal Society
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- Philosophy of artificial intelligence
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- Philosophy
- Philostratus
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- Phineas Fletcher
- Phishing
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- Phloem
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- Phocion
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- Phoenicia
- Phoenician alphabet
- Phoenix (constellation)
- Phoenix (manga)
- Phoenix (mythology)
- Phoenix Islands Protected Area
- Phoenix Islands
- Phoenix, Arizona
- Pholcidae
- Pholcus phalangioides
- Phoneme
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- PhoneNET
- Phonetics
- Phoneutria
- Phonocardiogram
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- Phonograph
- Phonological change
- Phonological development
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- Phonology
- Phonophobia
- Phoronid
- Phorusrhacidae
- Phorusrhacos
- Phosgenite
- Phosphate mineral
- Phosphate mining in Banaba and Nauru
- Phosphate
- Phosphine
- Phosphite anion
- Phospholipid
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- Photios I of Constantinople
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- Photomultiplier tube
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- Photonics
- Photophobia
- Photorealism
- Photoreceptor cell
- Photosphere
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- Phototube
- Phowa
- PHP
- Phraates I
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- Piano Concerto No. 5 (Beethoven)
- Piano Sonata in B minor (Liszt)
- Piano Sonata No. 2 (Chopin)
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- Pier
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- Pierre Dupont
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- Pierre Émile Levasseur
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- Pierre François le Courayer
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- Pierre Gaspard Chaumette
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- Pierre Guérin de Tencin
- Pierre Guillaume Frédéric le Play
- Pierre Henri Larcher
- Pierre Hyacinthe Azaïs
- Pierre Janssen
- Pierre Jean Baptiste Choudard Desforges
- Pierre Jean Édouard Desor
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- Pierre Jeannin
- Pierre Jurieu
- Pierre Laffitte
- Pierre Laromiguière
- Pierre Le Pesant, sieur de Boisguilbert
- Pierre Leroux
- Pierre Loti
- Pierre Louis Charles de Failly
- Pierre Louis Maupertuis
- Pierre Louis Napoleon Cavagnari
- Pierre Louis Prieur
- Pierre Louis Roederer
- Pierre Marie Auguste Broussonet
- Pierre Mignard
- Pierre Napoléon Bonaparte
- Pierre Paul Leroy-Beaulieu
- Pierre Paul Royer-Collard
- Pierre Prévost (physicist)
- Pierre Prieur
- Pierre Puget
- Pierre Séguier
- Pierre Simon Fournier
- Pierre Subleyras
- Pierre Terrail, seigneur de Bayard
- Pierre Victor, baron de Besenval de Brünstatt
- Pierre Victor, baron Malouet
- Pierre Victurnien Vergniaud
- Pierre Waldeck-Rousseau
- Pierre-Antoine Berryer
- Pierre-Antoine Lebrun
- Pierre-Auguste Renoir
- Pierre-Chéri Lafont
- Pierre-Claude Nivelle de La Chaussée
- Pierre-Jean Garat
- Pierre-Joseph Cambon
- Pierre-Joseph Desault
- Pierre-Laurent Buirette de Belloy
- Pierre-Louis Ginguené
- Pierre-Louis-Georges du Buat
- Pierre-Marie-Charles de Bernard du Grail de la Villette
- Pierre-Narcisse Guérin
- Pierre-Simon Ballanche
- Pierre, South Dakota
- Piers Gaveston, 1st Earl of Cornwall
- Piers Plowman
- Piet Cronjé
- Piet Joubert
- Piet Pieterszoon Hein
- Pietà (Michelangelo)
- Pieter Aertsen
- Pieter Melvill van Carnbee (geographer)
- Pieter van Laer
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- Pietermaritzburg
- Pietism
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- Pietro Alcionio
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- Pietro Giannone
- Pietro Metastasio
- Pietro Micca
- Pietro Perugino
- Pietro Pomponazzi
- Pietro Torrigiano
- Piezoelectricity
- Pig farming
- Pig iron
- Pig
- Pigault-Lebrun
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- Pigeon Post
- Pigeon racing
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- Pigeonite
- Pigment
- Pika
- Pikachu
- Pikaia
- Pike (weapon)
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- Pilgrims (Plymouth Colony)
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- Pilibhit
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- Pillion
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- Pilot fish
- Pilot whale
- Pilus
- Pimpri-Chinchwad
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- Pinacotheca
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- Pinch (unit)
- Pinchas Goldhar
- Pind Dadan Khan
- Pindar's First Olympian Ode
- Pindar
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- Pine
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- Pingdingshan
- Pingtung County
- Pinguicula
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- Pink
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- Pinnidae
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- Pint
- Pinto bean
- Pinturicchio
- Pinus elliottii
- Pinus halepensis
- Pinus lambertiana
- Pinus longaeva
- Pinus pinaster
- Pinus ponderosa
- Pinus strobus
- Pinus sylvestris
- Pinus taeda
- Pinwheel Galaxy
- Pinyin
- Pio di Savoia
- Pion
- Pioneer 10
- Pioneer 11
- Pioneer Island (Russia)
- Pioneer program
- Piotrków Trybunalski
- Pipe (fluid conveyance)
- Pipe and tabor
- Pipe flow
- Pipe organ
- Pipefish
- Pipeline transport
- Piper cubeba
- Piperazine
- Piperno
- Piperonal
- Pipi Natural Bridge
- Pipit
- Pippi Longstocking (novel)
- Pippi Longstocking
- Piprahwa
- Piqué work
- Piquet
- Piracy
- Piraeus
- Pirallahi Island
- Piran
- Piranha
- Pirate Parties International
- Pirkei Avot
- Pirmasens
- Pirn
- Pisa
- Pisanello
- Pisces (constellation)
- Pisces–Cetus Supercluster Complex
- Piscina
- Piscis Austrinus
- Písek
- Pishin District
- Pishin, Pakistan
- Pisidia
- Piss Christ
- Pistachio
- Pistol
- Pistole
- Piston
- Pistonless rotary engine
- Pit bull
- Pit viper
- Pitaya
- Pitcairn Islands
- Pitch (card game)
- Pitch (music)
- Pitcher plant
- Pitchfork
- Pitchstone
- Pith
- Pithiviers
- Pithom
- Pitigliano
- Pitt Island
- Pittacus of Mytilene
- Pittance
- Pittsburgh
- Pittston, Pennsylvania
- Pituitary gland
- Pity
- Piura
- Pius
- Pixel
- Pixiu
- Pınargözü Cave
- Placard
- Placebo
- Placenta
- Placerias
- Placido Columbani
- Placodermi
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- Placozoa
- Plagiarism
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- Plague (disease)
- Plaice
- Plain text
- Plain weave
- Plain
- Plains zebra
- Plaintext
- Plaintiff
- Planar graph
- Planarian
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- Planck constant
- Planck postulate
- Planck units
- Planck's law
- Plane (geometry)
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- Plane table
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- Planet Nine
- Planet
- Planetarium
- Planetary core
- Planetary differentiation
- Planetary equilibrium temperature
- Planetary habitability
- Planetary mass
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- Planetary nebula
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- Planetary science
- Planetary system
- Planetesimal
- Planets beyond Neptune
- Plankton
- Planned Parenthood
- Planning permission
- Plant anatomy
- Plant breeding
- Plant cell
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- Plant embryonic development
- Plant hormone
- Plant morphology
- Plant nursery
- Plant nutrition
- Plant pathology
- Plant physiology
- Plant propagation
- Plant reproduction
- Plant reproductive morphology
- Plant stem
- Plant
- Plantations of Ireland
- Planthopper
- Plasma (physics)
- Plasma display
- Plasma recombination
- Plasmatron
- Plasmid
- Plasmodesma
- Plasmodium
- Plaster
- Plasterwork
- Plastic bag
- Plastic bullet
- Plastic explosive
- Plastic mulch
- Plastic pollution
- Plastic surgery
- Plastic
- Plasticity (physics)
- Plastics engineering
- Plastid
- Platanus
- Platax
- Plate armour
- Plate girder bridge
- Plate tectonics
- Plateau State
- Plateau
- Plated ware
- Platelet
- Plateosaurus
- Plating
- Platinum group
- Platinum
- Plato
- Platon Levshin
- Platonic love
- Platonic realism
- Platonic solid
- Platte River
- Plattsmouth, Nebraska
- Platybelodon
- Platycodon
- Platypterygius
- Platypus
- Play (activity)
- Play (theatre)
- Playboy
- Playtime
- Playwright
- Plea bargain
- Plea
- Pleading
- Pleasure
- Plecoptera
- Pledge of Allegiance
- Pleiades (Greek mythology)
- Pleiades
- Pleistocene
- Plesiosaur
- Plesiosauroidea
- Plesiosaurus
- Plesiosiro
- Plessy v. Ferguson
- Plethodontidae
- Pleurosauridae
- Pleurotus ostreatus
- Pliers
- Pliny the Elder
- Pliny the Younger
- Pliocene
- Pliosauroidea
- Ploceidae
- Ploidy
- Ploiești
- PLOS One
- Plot (narrative)
- Plotopteridae
- Plotter
- Plough
- Plovdiv
- Plover
- Plug flow reactor model
- Plug-in (computing)
- Plum pudding model
- Plum
- Plumb bob
- Plumbago drawing
- Plumber
- Plumbing
- Pluriarc
- Plus and minus signs
- Plus belle la vie
- Plush
- Pluto (mythology)
- Pluto
- Plutocracy
- Plutonium
- Pluvial lake
- Plymouth Colony
- Plymouth Rock chicken
- Plymouth, Massachusetts
- Plymouth
- Plympton
- Plynlimon
- Plzeň Region
- Plzeň
- Pneuma
- Pneumatic tube
- Pneumatics
- Pneumatolysis
- Pneumonia
- Pnictogen hydride
- Pnictogen
- Po (river)
- Poaceae
- Poaching
- Pobiti Kamani
- Pocket watch
- Pocketknife
- PocketZip
- Podcast
- Podgorica
- Podgórze II
- Podiatry
- Podlaskie Voivodeship
- Podocarpus
- Podolia
- Podophyllum resin
- Podzol
- Poecilotheria metallica
- Poet
- Poetic Edda
- Poetic justice
- Poetics (Aristotle)
- Poetics
- Poetry
- Poggio Bracciolini
- Pogo (comic strip)
- Pogona
- Pohang
- Pohela Boishakh
- Pohnpei State
- Pohnpei
- Poikilotherm
- Poincaré conjecture
- Poinsettia
- Poinsot's ellipsoid
- Point (geometry)
- Point (typography)
- Point bar
- Point mutation
- Point particle
- Point source
- Pointe de Pen-Hir
- Pointe-à-Pitre
- Pointe-Noire
- Pointed set
- Pointer (computer programming)
- Pointillism
- Pointing device
- Pointing-out instruction
- Poipet
- Poise (unit)
- Poison dart frog
- Poison
- Poisoning of Alexander Litvinenko
- Poisoning of Alexei Navalny
- Poisoning
- Poisson distribution
- Poisson point process
- Poisson's equation
- Poisson's ratio
- Poitiers
- Poitou-Charentes
- Pokémon (TV series)
- Pokhara
- Polabian Slavs
- Poland China
- Poland
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- Polar bear
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- Polar coordinate system
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- Polarizer
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- Polio
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- Polish population transfers (1944–1946)
- Polish–Lithuanian Commonwealth
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- Politics
- Poliziano
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- Pollicipes pollicipes
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- Pollock
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- Polokwane
- Polonium hydride
- Polonium
- Poltava Oblast
- Poltava
- Poltergeist
- Poltroon
- Poluwat
- Poly(methyl methacrylate)
- Polyacrylonitrile
- Polyamide-imide
- Polyatomic ion
- Polybolos
- Polybutadiene
- Polycarbonate
- Polycentric law
- Polychaete
- Polycotylidae
- Polyculture
- Polycyclic aromatic hydrocarbon
- Polyester
- Polyethylene glycol
- Polyethylene terephthalate
- Polyethylene
- Polygala senega
- Polygala
- Polygenism
- Polyglot (book)
- Polygnotus
- Polygon
- Polygonal number
- Polygraph (duplicating device)
- Polyhedron
- Polyisoprene
- Polykleitos
- Polymer backbone
- Polymer chemistry
- Polymer engineering
- Polymer physics
- Polymer
- Polymerase chain reaction
- Polymerization
- Polymorphism (materials science)
- Polynesia
- Polynesian culture
- Polynesian languages
- Polynesian narrative
- Polynesian navigation
- Polynesian outlier
- Polynesian rat
- Polynesians
- Polynomial ring
- Polynomial
- Polyol
- Polyp (zoology)
- Polyphenol
- Polypodium
- Polypropylene glycol
- Polypropylene
- Polypus
- Polysaccharide
- Polysporangiophyte
- Polystichum acrostichoides
- Polystyrene
- Polysulfane
- Polysulfide
- Polytechnic University of Milan
- Polytetrafluoroethylene
- Polytheism
- Polytheistic reconstructionism
- Polytrauma
- Polyurethane
- Polyvinyl acetate
- Polyvinyl alcohol
- Polyvinyl chloride
- Polyyne
- Pomacanthidae
- Pomander
- Pomegranate
- Pomelo
- Pomerania
- Pomeranian dog
- Pomeranian Voivodeship
- Pomfret
- Pommer
- Pomology
- Pomona College
- Pomp and Circumstance Marches
- Pompeii
- Pompeo Batoni
- Pompeu Fabra University
- Pomponio Amalteo
- Pomponius Mela
- Pomponius Porphyrion
- Pomposa Abbey
- Ponca
- Ponce Denis Écouchard Lebrun
- Ponce, Puerto Rico
- Pond
- Pondicherry
- Pondweed
- Poniatowski
- Ponnani
- Pons
- Pont Alexandre III
- Pont d'Arc
- Pont de la Concorde (Paris)
- Pont du Gard
- Pont Neuf
- Pont-Audemer
- Ponta Delgada
- Ponta do Seixas
- Ponte Sant'Angelo
- Ponte Vecchio
- Ponteareas
- Pontederia crassipes
- Pontianak
- Pontic Mountains
- Pontifical Xavierian University
- Pontine Marshes
- Pontivy
- Pontoon bridge
- Pontremoli
- Pony Club Association of Victoria
- Pony
- Poodle
- Pop art
- Pop music
- Pop rock
- Pop-punk
- Pope Adrian I
- Pope Adrian VI
- Pope Agapetus II
- Pope Alexander II
- Pope Alexander III
- Pope Alexander IV
- Pope Alexander VI
- Pope Alexander VII
- Pope Alexander VIII
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- Pope Anastasius III
- Pope Anastasius IV
- Pope Benedict I
- Pope Benedict XI
- Pope Boniface IX
- Pope Boniface V
- Pope Boniface VI
- Pope Clement III
- Pope Clement XIII
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- Pope Gregory VII
- Pope Joan
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- Pope John XI
- Pope John XII
- Pope John XIV
- Pope John XV
- Pope John XVII
- Pope Leo IX
- Pope Leo XII
- Pope Liberius
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- Pope Lucius III
- Pope Miltiades
- Pope Nicholas II
- Pope Nicholas III
- Pope Nicholas IV
- Pope Paschal I
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- Pope Pius VI
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- Pope Zephyrinus
- Pope Zosimus
- Pope
- Poperinge
- Popillia gens
- Poplin
- Popocatépetl
- Popol Vuh
- Poposauroidea
- Poppyseed oil
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- Popular Science
- Popular science
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- Population ageing
- Population bottleneck
- Population decline
- Population density
- Population exchange between Greece and Turkey
- Population genetics
- Population growth
- Population history of Indigenous peoples of the Americas
- Population of Native California
- Population transfer in the Soviet Union
- Population
- Populism
- Populonia
- Populus tremuloides
- Populus trichocarpa
- Populus
- Porcelain crab
- Porcelain
- Porch
- Porcupine
- Porcupinefish
- Poreč
- Porfiriato
- Porgy and Bess
- Pori
- Porism
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- Pornographic film
- Pornographic magazine
- Poro
- Porocephalida
- Porosity
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- Port Adelaide
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- Port Blair
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- Port Royal
- Port Said Governorate
- Port Said
- Port Sudan
- Port Vila
- Port-au-Prince
- Port-de-Paix
- Port-Vendres
- Port
- Portable media player
- Portable Network Graphics
- Portas
- Portative organ
- Portia (spider)
- Portia labiata
- Portici
- Portico
- Portière
- Portland cement
- Portland Group (geology)
- Portland, Maine
- Portland, Oregon
- PortMiami
- Portmore, Jamaica
- Portnoy's Complaint
- Porto Alegre
- Porto Torres
- Porto Velho
- Porto Venere
- Porto-Novo
- Porto
- Portrait miniature
- Portrait of Adele Bloch-Bauer I
- Portrait of an Artist (Pool with Two Figures)
- Portrait of Dr. Gachet
- Portrait of Juan de Pareja
- Portrait of Madame X
- Portrait photography
- Portrait
- Portsea Island
- Portsmouth
- Portugal in the Middle Ages
- Portugal
- Portuguese architecture
- Portuguese Colonial War
- Portuguese colonization of the Americas
- Portuguese Empire
- Portuguese India
- Portuguese language
- Portuguese literature
- Portuguese man o' war
- Portuguese–Mamluk naval war
- Portunidae
- Portus
- Porvoo
- Poseidon
- Posidonius
- Position (geometry)
- Position and momentum spaces
- Position angle
- Position operator
- Positional notation
- Positive organ
- Positivism
- Positron emission tomography
- Positron
- Positronium
- POSIX
- Possession (Byatt novel)
- Possession of stolen goods
- Possessive
- Pößneck
- Post and lintel
- Post and pair
- Post-classical history
- Post-Impressionism
- Post-industrial society
- Post-nasal drip
- Post-Newtonian expansion
- Post-production
- Post-romanticism
- Post-Soviet conflicts
- Post-Soviet states
- Post-transcriptional modification
- Post-translational modification
- Post-traumatic stress disorder
- Post–World War II economic expansion
- Post's theorem
- Postage stamp
- Postal history
- Posterior probability
- Postern
- Postgraduate education
- Postharvest
- Posthumanism
- Postil
- Postilion
- Postmodern architecture
- Postmodern art
- Postmodern music
- Postmodernism
- Postmodernist film
- Postojna Cave
- Postosuchus
- PostScript fonts
- Postterm pregnancy
- Potala Palace
- Potamotrygonidae
- Potash
- Potassium acetate
- Potassium alum
- Potassium bitartrate
- Potassium bromide
- Potassium chloride
- Potassium chromate
- Potassium citrate
- Potassium cyanide
- Potassium dichromate
- Potassium ferricyanide
- Potassium ferrocyanide
- Potassium hydride
- Potassium hydroxide
- Potassium iodide
- Potassium manganate
- Potassium nitrate
- Potassium oxide
- Potassium perchlorate
- Potassium permanganate
- Potassium peroxide
- Potassium sulfide
- Potassium superoxide
- Potassium-40
- Potassium
- Potato race
- Potato
- Potential energy
- Potential theory
- Potential well
- Potentiometer
- Pothook
- Potoo
- Potoroo
- Potsdam Conference
- Potsdam
- Potter's wheel
- Pottery
- Pouched lamprey
- Poultice
- Poultry farming
- Pound (force)
- Pound (mass)
- Pound per square inch
- Pound sterling
- Poussinists and Rubenists
- Pouteria australis
- Poverty threshold
- Poverty
- Povindah
- Powder coating
- Powder keg
- Power (physics)
- Power (social and political)
- Power engineering
- Power good signal
- Power hammer
- Power inverter
- Power loom
- Power of attorney
- Power rule
- Power series solution of differential equations
- Power series
- Power set
- Power station
- Power supply unit (computer)
- Power supply
- Power system protection
- Power-flow study
- Powered paragliding
- Poyang Lake
- Poynting vector
- Požarevac
- Poznań
- Pozoblanco
- Prachov Rocks
- Practice of law
- Praemunire
- Praetorian prefect
- Praetutii
- Pragmatics
- Pragmatism
- Prague Metro
- Prague Spring
- Prague
- Praguerie
- Praia da Rocha
- Praia
- Prairie dog
- Prairie
- Prajnaparamita
- Prajñaptivāda
- Pramana
- Prambanan
- Praseodymium
- Pratap Singh of Idar
- Pratas Island
- Pratinas
- Pratincole
- Pratītyasamutpāda
- Prato
- Pratyaksha
- Pravachanasara
- Pravda
- Prawn
- Praxias and Androsthenes
- Praxilla
- Praxiteles
- Praya dubia
- Prayer for the dead
- Prayer of Manasseh
- Prayer wheel
- Prayer
- Pre-Columbian art
- Pre-Columbian era
- Pre-existence
- Pre-exponential factor
- Pre-industrial society
- Pre-Islamic Arabia
- Pre-main-sequence star
- Pre-Pottery Neolithic A
- Pre-Pottery Neolithic B
- Pre-Pottery Neolithic
- Pre-production
- Pre-Raphaelite Brotherhood
- Pre-Socratic philosophy
- Pre-stellar core
- Preamble
- Precambrian
- Precarium
- Precast concrete
- Precedent
- Precentor
- Precept
- Precession
- Precious coral
- Precious metal
- Precipitation (chemistry)
- Precipitation hardening
- Precipitation
- Precipitin
- Preconization
- Predation
- Predatory publishing
- Predestination in Islam
- Predestination
- Predicable
- Predicament
- Predicted impact of Brexit
- Preemption (computing)
- Preface
- Prefecture
- Prefectures of Japan
- Prefectures of the Central African Republic
- Preferred stock
- Pregnancy (mammals)
- Pregnancy in fish
- Pregnancy test
- Pregnancy
- Prehensile-tailed porcupine
- Prehistoric art
- Prehistoric Egypt
- Prehistoric music
- Prehistoric religion
- Prehistoric technology
- Prehistory of Australia
- Prehistory of the United States
- Prehistory
- Prejudice
- Prelude (music)
- Prélude à l'après-midi d'un faune
- Prelude in C-sharp minor (Rachmaninoff)
- Prelude to the 2022 Russian invasion of Ukraine
- Premenstrual syndrome
- Premonstratensians
- Přemysl the Ploughman
- Prenex normal form
- Preorder
- Preposition and postposition
- Preppy
- Preprint
- Prerogative court
- Prerogative writ
- Prerogative
- Přerov
- Presbyopia
- Presbyornis
- Presbyterian Church of Wales
- Presbyterianism
- Preschool
- Prescott Gardner Hewett
- Prescription drug
- Presentationism
- Preserved counties of Wales
- President (government title)
- Press cake
- Press laws
- Press Trust of India
- Press TV
- Pressure vessel
- Pressure–volume diagram
- Pressure
- Pressurized heavy-water reactor
- Presteigne
- Prestonpans
- Prestressed concrete
- Prestwich
- Presumption of innocence
- Preterm birth
- Pretoria
- Pretorius
- Pretty Cure
- Pretty Polly (horse)
- Prevailing winds
- Preventive healthcare
- Priacanthidae
- Priapeia
- Priapulida
- Příbram
- Price revolution
- Priceite
- PricewaterhouseCoopers
- Pride and Prejudice
- Pride
- Prie-dieu
- Priego de Córdoba
- Priene
- Priest
- Prim's algorithm
- Primage
- Primality test
- Primary and secondary legislation
- Primary color
- Primary education
- Primary mineral
- Primary mirror
- Primate
- Primavera (Botticelli)
- Prime meridian
- Prime minister
- Prime number theorem
- Prime number
- Prime vertical
- Prime-counting function
- Primetime Emmy Awards
- Primitive Methodist Church
- Primitive recursive function
- Primordial fluctuations
- Primordial nuclide
- Primorsky Krai
- Primrose League
- Primula matthioli
- Primula
- Primulaceae
- Primuline
- Prince Adolf of Auersperg
- Prince Arthur, Duke of Connaught and Strathearn
- Prince Charming
- Prince Edward Island
- Prince Edward Islands
- Prince Hamlet
- Prince Henri of Orléans
- Prince Moritz of Anhalt-Dessau
- Prince of Wales Island (Alaska)
- Prince of Wales Island (Nunavut)
- Prince Philippe, Count of Paris
- Prince Philippe, Duke of Orléans (1869–1926)
- Prince Rupert of the Rhine
- Prince William, Duke of Cumberland
- Prince-elector
- Prince
- Princely Abbey of Corvey
- Princely state
- Princes of Condé
- Princes of Conti
- Princess Anne County, Virginia
- Princess Leia
- Princess Louise of Stolberg-Gedern
- Princess Mononoke
- Princeton University
- Principal component analysis
- Principal quantum number
- Principal–agent problem
- Principate
- Príncipe
- Principia Mathematica
- Principle of explosion
- Principle of relativity
- Principle
- Principles of Islamic jurisprudence
- Pringlea
- Print on demand
- Print syndication
- Printed circuit board
- Printer (computing)
- Printing press
- Printing
- Printmaking
- Prion
- Prior probability
- Priscus
- Prism (geometry)
- Prism lighting
- PRISM
- Prism
- Prison Break
- Prison escape
- Prison rape
- Prison
- Prisoner (TV series)
- Prisoner of war
- Prisoner's dilemma
- Pristina
- Prittlewell
- Privacy-invasive software
- Privacy
- Private collection
- Private equity
- Private Eye
- Private law
- Private Lives
- Private network
- Private property
- Private transport
- Privateer
- Proactive law
- Probabilism
- Probability amplitude
- Probability density function
- Probability distribution
- Probability mass function
- Probability space
- Probability theory
- Probability
- Problem of evil
- Problem of induction
- Problem of universals
- Problem solving
- Problem statement
- Probolinggo
- Proboscidea
- Proboscis monkey
- Proby Cautley
- Procaine
- Procedural law
- Procedural modeling
- Proceedings of the National Academy of Sciences of the United States of America
- Proceedings of the Royal Society
- Procellariidae
- Procellariiformes
- Procès-verbal
- Process (computing)
- Process design
- Process engineering
- Procession
- Processor register
- Proclamation of the Republic (Brazil)
- Proclamation
- Proclus
- Procne
- Proconsul (mammal)
- Procopius of Gaza
- Procter & Gamble
- Proctor
- Proculus
- Procuration
- Procyon
- Procyonidae
- Prodicus
- Product (category theory)
- Product (chemistry)
- Product (mathematics)
- Product design
- Product rule
- Production (economics)
- Production function
- Production set
- Production–possibility frontier
- Productive efficiency
- Productivity (ecology)
- Productivity
- Profanity
- Profanum
- Professional certification
- Professional video camera
- Professional wrestling
- Profit (accounting)
- Profit (economics)
- Profit maximization
- Profit sharing
- Proganochelys
- Progestogen
- Proglacial lake
- Programme for International Student Assessment
- Programmed cell death
- Programmer
- Programming language
- Programming paradigm
- Progressive Era
- Progressive music
- Progressive Party (United States, 1912)
- Progressive scan DVD player
- Progressive scan
- Progressivism
- Progymnosperm
- Prohibition in the United States
- Prohibition of drugs
- Project Gemini
- Project management
- Project Mercury
- Projectile motion
- Projectile
- Projector
- Prokaryote
- Prokop the Great
- Proletariat
- Prolibytherium
- Proline
- Prolocutor
- Prolog
- Prologue
- Prometheus Bound
- Promethium
- Promise
- Promontory
- Promoter (genetics)
- Pronghorn
- Pronoun
- Pronunciation
- Proof by contradiction
- Proofreading
- Propaganda
- Propan-1-ol
- Propane
- Propanol
- Propellant
- Propeller
- Proper motion
- Proper noun
- Proper time
- Properties of water
- Property crime
- Property insurance
- Property law
- Property tax
- Property
- Prophecy
- Prophet
- Prophetic biography
- Prophets and messengers in Islam
- ProPhoto RGB color space
- Propiolic acid
- Proplyd
- Propofol
- Proportion (architecture)
- Propositional calculus
- Propranolol
- Propylene carbonate
- Propylene
- ProQuest Dialog
- Prose Edda
- Prose poetry
- Prose
- Prosecutor
- Proselytism
- Proslogion
- Prosody (linguistics)
- Prosper Mérimée
- Prosper of Aquitaine
- Prosper Sainton
- Prospero Alpini
- Prospero Fontana
- Prostate cancer
- Prostějov
- Prosthesis
- Prostyle
- Protactinium
- Protagonist
- Protagoras (dialogue)
- Proteaceae
- Proteasome
- Protected area
- Protection
- Protectionism
- Protective relay
- Protein (nutrient)
- Protein biosynthesis
- Protein engineering
- Protein folding
- Protein structure
- Protein targeting
- Protein
- Proteinogenic amino acid
- Proteome
- Proteomics
- Proteomyxa
- Proterosuchus
- Proterozoic
- Protest song
- Protestantenverein
- Protestantism
- Protests against responses to the COVID-19 pandemic
- Protests against the Iraq War
- Protests of 1968
- Protist
- Proto-Indo-European mythology
- Proto-Indo-Europeans
- Proto-writing
- Protocarnivorous plant
- Protoceratops
- Protogenes
- Proton decay
- Proton–proton chain
- Proton
- Protonation
- Protonosphere
- Protoplanet
- Protoplanetary disk
- Protoplanetary nebula
- Protostar
- Protostome
- Protractor
- Protura
- Proustite
- Provence Alps and Prealps
- Provence
- Proverb
- Providence, Rhode Island
- Province of Carolina
- Province of Georgia
- Province of Maine
- Province of Maryland
- Province of Massachusetts Bay
- Province of New Hampshire
- Province of New Jersey
- Province of New York
- Province of North Carolina
- Province of Pennsylvania
- Province of South Carolina
- Province
- Provinces and territories of Canada
- Provinces of Angola
- Provinces of Argentina
- Provinces of Belgium
- Provinces of Burundi
- Provinces of China
- Provinces of Ecuador
- Provinces of Equatorial Guinea
- Provinces of Indonesia
- Provinces of Iran
- Provinces of Ireland
- Provinces of Japan
- Provinces of North Korea
- Provinces of Rwanda
- Provinces of South Africa
- Provinces of South Korea
- Provinces of the Democratic Republic of the Congo
- Provinces of the Netherlands
- Provinces of Zimbabwe
- Provisional Government of Western Thrace
- Provisional order
- Provisions of Oxford
- Provost (civil)
- Prowfish
- Proxima Centauri b
- Proxima Centauri
- Proximity fuze
- Proxy server
- Proxy war
- Prudence Crandall
- Prudentius
- Pruning
- Prunus
- Prussia
- Prussian blue
- Przewalski's horse
- Psalms of Asaph
- Psalms of Solomon
- Psalms
- Psamment
- Psamtik I
- Pseudo-Isidore
- Pseudo-Philo
- Pseudobornia
- Pseudocereal
- Pseudodipteral
- Pseudomonas aeruginosa
- Pseudoperipteros
- Pseudoprime
- Pseudoscience
- Pseudoscorpion
- Psilocybin mushroom
- Psilocybin
- Psilomelane
- Psilophytopsida
- Psittacosaurus
- Pskov Republic
- Psocoptera
- Psophia
- Psoralea esculenta
- Psorosperm
- PSR B1937+21
- Psychedelic drug
- Psychedelic music
- Psychiatric hospital
- Psychiatric medication
- Psychiatry
- Psycho (1960 film)
- Psychoactive drug
- Psychoanalysis
- Psychodidae
- Psycholinguistics
- Psychology of religion
- Psychology
- Psychopathy
- Psychophysical parallelism
- Psychosis
- Psychotherapy
- Ptah
- Pteranodon
- Pteraspis
- Pteridophyte
- Pteridospermatophyta
- Pteris
- Pterobranchia
- Pterocarpus indicus
- Pterodactylus
- Pterodaustro
- Pterois
- Pteron
- Pterophyllum
- Pteropus
- Pterosaur
- Pterygota
- Ptiloris
- Ptilostemon
- Ptolemaeus Chennus
- Ptolemaic dynasty
- Ptolemaic Kingdom
- Ptolemy I Soter
- Ptolemy II Philadelphus
- Ptolemy IV Philopator
- Ptolemy V Epiphanes
- Puberty
- Public administration
- Public domain
- Public health law
- Public health
- Public holiday
- Public inquiry
- Public interest
- Public liability
- Public library
- Public limited company
- Public policy
- Public relations
- Public space
- Public speaking
- Public transport bus service
- Public transport
- Public-key cryptography
- Public-order crime
- Public–private partnership
- Public
- Publican
- Publilius Optatianus Porfyrius
- Publilius Syrus
- Publishing
- Publius Clodius Pulcher
- Publius Clodius Thrasea Paetus
- Publius Cornelius Lentulus Spinther
- Publius Cornelius Lentulus Sura
- Publius Cornelius Scipio Nasica Serapio
- Publius Pomponius Secundus
- Publius Rupilius
- Publius Rutilius Lupus (consul)
- Publius Rutilius Rufus
- Publius Servilius Rullus
- Publius Sulpicius Rufus
- Publius Valerius Cato
- Publius Valerius Poplicola
- Pudu
- Pudukkottai
- Puebla (city)
- Puebla
- Pueblo pottery
- Puebloans
- Puente del Inca
- Puente Genil
- Puerto Cabello
- Puerto Princesa
- Puerto Real
- Puerto Rico
- Puerto Vallarta
- Puffbird
- Puffin
- Pug
- Pugachev's Rebellion
- Puget Sound
- Pugettia
- Pugwash Conferences on Science and World Affairs
- Puisne
- Puja (Hinduism)
- Puli Khumri
- Pulitzer Prize
- Pull-apart basin
- Pullback (category theory)
- Pulley
- Pulmonary alveolus
- Pulmonology
- Pulp (paper)
- Pulp Fiction
- Pulsar
- Pulse (physics)
- Pulse
- Puma (brand)
- Pumice
- Pump organ
- Pump
- Pumped-storage hydroelectricity
- Pumping station
- Pumpkin
- Pumpkinseed
- Puncak Jaya
- Punch (magazine)
- Punch and Judy
- Punched card input/output
- Puncheon (unit)
- Punctuation
- Pune
- Punic Wars
- Punishment
- Punjab, India
- Punjab, Pakistan
- Punjab
- Punjabi language
- Punji stick
- Punk rock
- Punk subculture
- Punkah
- Punta Arenas
- Punta Pariñas
- Puntarenas
- Puntland
- Punxsutawney Phil
- Pupa
- Pupfish
- Pupil
- Puppet
- Puppetry
- Puppis
- Puranas
- Puranic chronology
- Purbeck Group
- Purchasing
- Purdue University
- Pure Land Buddhism
- Pure mathematics
- Purebred
- Purépecha Empire
- Purgatorius
- Purgatory
- Purified water
- Purim
- Purine
- Puritans
- Purkinje effect
- Purlieu
- Purlin
- Purnia
- Puroresu
- Purple Haze
- Purple
- Purser
- Purulia
- Push technology
- Push–relabel maximum flow algorithm
- Pushball
- Pushkar
- Pushkin Museum
- Pushout (category theory)
- Pushyabhuti dynasty
- Puss in Boots
- Put option
- Putorana Nature Reserve
- Putorana Plateau
- Putrajaya
- Putrescine
- Puttee
- Puy
- Puya (plant)
- Pyanopsia
- Pyapon
- Pyatigorsk
- Pyay
- Pye-dog
- Pyeongtaek
- Pygmalion (play)
- Pygmy hippopotamus
- Pygmy marmoset
- Pygmy sperm whale
- Pyin Oo Lwin
- Pyongyang
- Pyotr Andreyevich Shuvalov
- Pyotr Andreyevich Tolstoy
- Pyotr Chikhachyov
- Pyotr Ilyich Tchaikovsky
- Pyotr Wrangel
- Pyramid (geometry)
- Pyramid Lake (Nevada)
- Pyramid of Djoser
- Pyramid of the Sun
- Pyramid
- Pyramidion
- Pyrargyrite
- Pyrazine
- Pyrazole
- Pyrene
- Pyrenean Mountain Dog
- Pyrénées-Atlantiques
- Pyrenees
- Pyrgi
- Pyridine
- Pyridoxine
- Pyrimidine
- Pyrite
- Pyroclastic flow
- Pyroelectricity
- Pyrogallol
- Pyrolusite
- Pyrolysis
- Pyromorphite
- Pyrone
- Pyrope
- Pyrophoricity
- Pyrophyllite
- Pyroxene
- Pyrrho
- Pyrrhocoris apterus
- Pyrrhotite
- Pyrrole
- Pyrus × bretschneideri
- Pyrus communis
- Pyrus pyrifolia
- Pythagorean theorem
- Pytheas
- Pythia
- Python (genus)
- Python (programming language)
- Pythonidae
- Pyu city-states
- Pyxis
- Qadi Baydawi
- Qaem Shahr
- Qaidam Basin
- Qajar dynasty
- Qalati Ghilji
- Qalyubiyya Governorate
- Qanat
- QAnon
- Qantas
- Qara Khitai
- Qara Qoyunlu
- Qarchak
- Qarmatians
- Qarshi
- Qasigiannguit
- Qatar diplomatic crisis
- Qatar
- Qatif
- Qawwali
- Qazvin province
- QCD matter
- Qena Governorate
- Qeshm Island
- Qi (state)
- Qi
- Qibla
- Qiemo County
- Qijia culture
- Qilian Mountains
- Qilin
- Qin dynasty
- Qin Hui
- Qin River (Shanxi)
- Qin Shi Huang
- Qin's wars of unification
- Qing dynasty
- Qingdao
- Qinghai Lake
- Qinghai
- Qingming Festival
- Qinhuangdao
- Qinling
- Qiongzhou Strait
- Qiqihar
- Qiu Chuji
- Qixi Festival
- Qiyas
- Qizilbash
- Qods, Iran
- Qoʻngʻirot
- Qolasta
- Qom province
- Qom
- Qonce
- QR code
- Quackery
- Quad Cities
- Quad flat package
- Quadrans Muralis
- Quadrant (instrument)
- Quadratic equation
- Quadratic formula
- Quadratic function
- Quadratic reciprocity
- Quadratic residue
- Quadratrix
- Quadrilateral
- Quadrumana
- Quadrupedalism
- Quaich
- Quaint
- Quakers
- Qualcomm
- Qualitative inorganic analysis
- Qualitative research
- Quality (business)
- Quan Tangshi
- Quantifier (logic)
- Quantifier elimination
- Quantitative analysis (chemistry)
- Quantitative genetics
- Quantitative linguistics
- Quantitative research
- Quantization (physics)
- Quantum chemistry
- Quantum chromodynamics
- Quantum cohomology
- Quantum computing
- Quantum electrodynamics
- Quantum entanglement
- Quantum field theory
- Quantum fluctuation
- Quantum foam
- Quantum gravity
- Quantum harmonic oscillator
- Quantum indeterminacy
- Quantum mechanics
- Quantum number
- Quantum potential
- Quantum state
- Quantum superposition
- Quantum tunnelling
- Quantum
- Quanzhou
- Quarantine
- Quare impedit
- Quark epoch
- Quark model
- Quark star
- Quark
- Quarry
- Quart
- Quarterdeck
- Quarterstaff
- Quartic function
- Quartz clock
- Quartz-porphyry
- Quartz
- Quartzite
- Quasar
- Quasi-contract
- Quasi-War
- Quasiparticle
- Quasistatic process
- Quaternary ammonium cation
- Quaternary extinction event
- Quaternary glaciation
- Quaternary numeral system
- Quaternary
- Quatrefoil
- Quba rugs and carpets
- Quchan
- Quebec City
- Quebec French
- Quebec
- Quechua people
- Quechuan languages
- Queen Anne's Bounty
- Queen Elizabeth Islands
- Queen Mary University of London
- Queen Maud Land
- Queen of Sheba
- Queen regnant
- Queen's University Belfast
- Queens
- Queensland
- Queenstown, Tasmania
- Quelimane
- Quenching
- Quentin Matsys
- Quercitron
- Quercus acutissima
- Quercus alba
- Quercus macrocarpa
- Quercus oblongifolia
- Quercus robur
- Quercus rubra
- Quercus suber
- Quercus velutina
- Quercus virginiana
- Quercy
- Querétaro City
- Querétaro
- Querfurt
- Query optimization
- Question mark
- Quetta
- Quetzal
- Quetzalcoatl
- Quetzalcoatlus
- Quetzaltenango
- Queue (abstract data type)
- Quezon City
- Qufu
- Quicksort
- Quickstep
- Quillaja saponaria
- Quillota
- Quilting
- Quimperlé
- Quinary
- Quinazoline
- Quince
- Quinine
- Quinoa
- Quinone
- Quinoxaline
- Quinquennial visit ad limina
- Quintain (jousting)
- Quintana Roo
- Quintessence (physics)
- Quintin Craufurd
- Quintino Sella
- Quintus Cassius Longinus
- Quintus Claudius Quadrigarius
- Quintus Cornificius
- Quintus Fufius Calenus
- Quintus Gargilius Martialis
- Quintus Hortensius
- Quintus Lutatius Catulus (consul 102 BC)
- Quintus Roscius Gallus
- Quintus Sertorius
- Quintus Smyrnaeus
- Quintus Terentius Scaurus
- Quipu
- Quirites
- Quito
- Quiver
- Qujing
- Quo Vadis (novel)
- Quoits
- Quokka
- Quoll
- Quotation mark
- Quotations from Chairman Mao Tse-tung
- Quran
- Qutb Shahi dynasty
- Quy Nhon
- QWERTY
- R (programming language)
- R-process
- R. A. Torrey
- R. M. Ballantyne
- R/K selection theory
- R136
- Ra
- Rabanus Maurus
- Rabat
- Rabba
- Rabbah bar Nahmani
- Rabban Bar Sauma
- Rabbeinu Tam
- Rabbet
- Rabbi Akiva
- Rabbi Jonah
- Rabbi
- Rabbinic Judaism
- Rabbit (Koons)
- Rabbit fish
- Rabbit, Run
- Rabbit
- Rabbitfish
- Rabbitkettle Hot Springs
- Rabbula
- Rabie
- Rabies vaccine
- Rabies
- Rabih az-Zubayr
- Rabindranath Tagore
- Råbjerg Mile
- Racconigi
- Raccoon
- Race (human categorization)
- Racemic mixture
- Racemization
- Racewalking
- Raceway (aquaculture)
- Rạch Giá
- Rachel
- Rachis
- Racial segregation in the United States
- Racism
- Rack and pinion
- Rackets (sport)
- Rad (unit)
- Radar
- Rădăuți
- Radeberg
- Radegund
- Radetzky March
- Radevormwald
- Radha
- Radhanpur
- Radial engine
- Radial velocity
- Radian per second
- Radian
- Radiance
- Radiant flux
- Radiata
- Radiation pressure
- Radiation protection
- Radiation therapy
- Radiation zone
- Radiation
- Radiative transfer
- Radical (chemistry)
- Radical feminism
- Radical media
- Radical polymerization
- Radicle
- Radio astronomy
- Radio broadcasting
- Radio drama
- Radio frequency
- Radio galaxy
- Radio network
- Radio personality
- Radio program
- Radio receiver
- Radio spectrum pollution
- Radio telescope
- Radio Times
- Radio wave
- Radio-frequency engineering
- Radio-quiet neutron star
- Radio
- Radioactive decay
- Radioactive source
- Radioactive tracer
- Radioanalytical chemistry
- Radiocarbon dating
- Radiography
- Radiolaria
- Radiology
- Radiometric dating
- Radiometry
- Radish
- Radium
- Radius (bone)
- Radius of convergence
- Radius
- Radix sort
- Radomsko
- Radon-222
- Radon
- Raebareli district
- Raebareli
- Raetia
- Raffaellino del Garbo
- Raffaello Fabretti
- Raffaello Maffei
- Raffaello Sanzio Morghen
- Rafflesia arnoldii
- Rafīq Bey al-ʿAzm
- Rafter
- Rag-stone
- Raga
- Ragamuffin cat
- Ragatz
- Ragdoll
- Rage (emotion)
- Raging Bull
- Ragman Rolls
- Ragnar Lodbrok
- Ragnarök
- Ragtime
- Ragunan Zoo
- Rahim Yar Khan
- Rahway, New Jersey
- Raï
- RAID
- Raiders of the Lost Ark
- Raigarh
- Raijin
- Rail (bird)
- Rail freight transport
- Rail transport
- Rail yard
- Railgun
- Railjet
- Railroad car
- Railway electrification system
- Railway engineering
- Railway platform
- Railway track
- Raimondo Montecuccoli
- Rain and snow mixed
- Rain shadow
- Rain
- Rainbow body
- Rainbow Bridge (Niagara Falls)
- Rainbow Bridge (Tokyo)
- Rainbow Bridge National Monument
- Rainbow lorikeet
- Rainbow matching
- Rainbow Serpent
- Rainbow
- Rainfed agriculture
- Rainforest
- Raipur
- Raised field
- Raising a Flag over the Reichstag
- Raising the Flag on Iwo Jima
- Rajahmundry
- Rājākariya
- Rajarhat
- Rajasthan
- Rajavaliya
- Rajendralal Mitra
- Rajkot
- Rajmahal
- Rajpipla
- Rajpur Sonarpur
- Rajput painting
- Rajputana
- Rajshahi Division
- Rajshahi
- Rak (stream)
- Rake (tool)
- Rakhine State
- Rákóczi
- Rakshasa
- Raleigh, North Carolina
- Ralph Abercromby
- Ralph Agas
- Ralph Albert Blakelock
- Ralph Cudworth
- Ralph d'Escures
- Ralph de Diceto
- Ralph de Gael
- Ralph Fitch
- Ralph Hopton, 1st Baron Hopton
- Ralph Lingen, 1st Baron Lingen
- Ralph Montagu, 1st Duke of Montagu
- Ralph of Coggeshall
- Ralph Strode
- Ralph Tate
- Ralph Winwood
- Ralph
- Ralphie the Buffalo
- Rama
- Ramadan
- Ramadi
- Ramallah
- Raman spectroscopy
- Ramanathapuram
- Ramayan (1987 TV series)
- Ramayana
- Rambouillet sheep
- Ramcharitmanas
- Ramesses II
- RAMIS (software)
- Rammed earth
- Râmnicu Vâlcea
- Ramón de Campoamor y Campoosorio
- Ramón de la Cruz
- Ramón de Mesonero Romanos
- Ramon Llull
- Ramón María Narváez
- Rampart (fortification)
- Rampur, Uttar Pradesh
- Ramsbottom
- Ramsey theory
- Ramusio
- Ramzor
- Rana (genus)
- Ranatra
- Ranavalona III
- Rancagua
- Ranch
- Ranchi
- Randal MacDonnell, 1st Earl of Antrim
- Randan
- Randazzo
- Randers
- Randle Cotgrave
- Randolph Caldecott
- Random column packing
- Random variable
- Random-access memory
- Randomized controlled trial
- Range of a function
- Ranged weapon
- Rangefinder camera
- Rangpur Division
- Rangpur, Bangladesh
- Rani of Jhansi
- Ranina ranina
- Ranitidine
- Rank (linear algebra)
- Rankine cycle
- Rankine scale
- Rann of Kutch
- Ransomware
- Ranters
- Ranulf Flambard
- Ranulf Higden
- Raoul de Cambrai
- Raoul de Houdenc
- Raoul Island
- Rapallo
- Rape
- Rapeseed oil
- Rapeseed
- Raphael (archangel)
- Raphael Holinshed
- Raphaël, Comte de Casabianca
- Raphael
- Raphidophyte
- Rapid eye movement sleep
- Rapid transit
- Rapids
- Rapier
- Rapini
- Rapparee
- Rapper's Delight
- Rapping
- Rapture
- Raqqa
- RAR (file format)
- Rare Earth hypothesis
- Rare-earth barium copper oxide
- Rare-earth element
- Rarotonga
- Ras ben Sakka
- Ras Dashen
- Rash
- Rashbam
- Rashidun Caliphate
- Rashidun
- Rashomon
- Rasht Valley
- Rasht
- Rashtrakuta dynasty
- Rasmus Rask
- Raspberry Pi
- Raspberry
- Rastafari
- Rastatt
- Raster graphics
- Rat bike
- Rat
- Ratafia
- Ratchet (device)
- Rate equation
- Rate of return
- Rate-determining step
- Rathenow
- Ratification
- Ratio
- Rational ClearCase
- Rational function
- Rational number
- Rationalism (architecture)
- Rationalism
- Rationality
- Rationalization (psychology)
- Ratite
- Ratnapura
- Ratón
- Ratramnus
- Rattanakosin Kingdom (1782–1932)
- Rattlesnake
- Rav Giddel
- Rava (amora)
- Ravana
- Ravanahatha
- Rave
- Ravelin
- Ravenala
- Ravenna
- Ravi River
- Ravine
- Rawa, Iraq
- Rawalpindi
- Rawendis
- Rawicz
- Rawmarsh
- Rawson, Chubut
- Rawtenstall
- Ray (optics)
- Rayah
- Rayleigh number
- Rayleigh scattering
- Rayleigh–Bénard convection
- Raymond de Sauvetât
- Raymond FitzGerald
- Raymond IV, Count of Toulouse
- Raymond of Sabunde
- Raymond Poincaré
- Raymond VI, Count of Toulouse
- Raymond VII, Count of Toulouse
- Raymond
- Raynald of Châtillon
- Razavi Khorasan province
- Razgrad
- RCA Spectra 70
- Reaction (physics)
- Reaction coordinate
- Reaction intermediate
- Reaction mechanism
- Reaction progress kinetic analysis
- Reaction quotient
- Reaction rate constant
- Reaction rate
- Reactionary
- Reactive armour
- Reactivity (chemistry)
- Reactivity series
- Read-only memory
- Reader's Digest
- Reading, Berkshire
- Reading
- Ready-mix concrete
- Reagent
- Real analysis
- Real estate appraisal
- Real estate
- Real number
- Real tennis
- Real-time clock
- Real-time computing
- Real-time operating system
- Real-valued function
- Realism (arts)
- Reality television
- Reality
- Realm of New Zealand
- Reaper-binder
- Reaper
- Rear admiral
- Rear Window
- Rearrangement reaction
- Reason
- Rebab
- Rebar
- Rebecca (novel)
- Rebecca
- Rebellion of the Seven States
- Rebellion
- Rebellions of 1837–1838
- Rebirth (Buddhism)
- Reboot
- Recaizade Mahmud Ekrem
- Recanati
- Recapitulation theory
- Received Pronunciation
- Recent African origin of modern humans
- Recept
- Receptionist
- Receptor (biochemistry)
- Recessional velocity
- Recife
- Reciprocating engine
- Recognizance
- Recombinant DNA
- Recombination (cosmology)
- Reconnaissance aircraft
- Reconquista
- Reconstruction era
- Record producer
- Record sealing
- Recorder (musical instrument)
- Recovered Territories
- Recreational drug use
- Recreational mathematics
- Recruitment
- Recrystallization (chemistry)
- Recrystallization (geology)
- Rectangle
- Rectangular function
- Rectifier
- Recumbent bicycle
- Recurrence relation
- Recursion (computer science)
- Recurve bow
- Recuva
- Recycled wool
- Recycling
- Red algae
- Red blood cell
- Red Deer Cave people
- Red deer
- Red dwarf
- Red Flag Canal
- Red Fort
- Red fox
- Red giant
- Red junglefowl
- Red kangaroo
- Red king crab
- Red mullet
- Red panda
- Red River (Asia)
- Red River Delta
- Red river hog
- Red River of the North
- Red River of the South
- Red Rock (bull)
- Red Rum
- Red Sea Governorate
- Red Sea
- Red Sorghum (novel)
- Red Square
- Red squirrel
- Red supergiant
- Red Terror (Spain)
- Red-bellied black snake
- Red-billed quelea
- Red-eared slider
- Red-giant branch
- Red–black tree
- Red
- Redback spider
- Redbad, King of the Frisians
- Redcurrant
- Redlich–Kwong equation of state
- Redlining
- Redoubt
- Redox indicator
- Redox
- Redshift
- Reduced mass
- Reducing agent
- Reduct
- Reduction (orthopedic surgery)
- Reduction potential
- Reductionism
- Reduplication
- Reduviidae
- Redwood National and State Parks
- Reed (mouthpiece)
- Reed–Solomon error correction
- Reedbuck
- Reedfish
- Reef knoll
- Reef lobster
- Refectory
- Reference ellipsoid
- Reference work
- Reference
- Referendum
- Reflecting telescope
- Reflection (mathematics)
- Reflection (physics)
- Reflection coefficient
- Reflection nebula
- Reflection seismology
- Reflective memory
- Reflex
- Reflexive relation
- Reform Judaism
- Reformation
- Reformatory
- Reformed Church in the United States
- Reformed Episcopal Church
- Refracting telescope
- Refraction
- Refractive error
- Refractive index
- Refractometry
- Refresher
- Refrigeration
- Refrigerator
- Refuge in Buddhism
- Refugee
- Regalia
- Régence
- Regeneration (biology)
- Regenerative agriculture
- Regensburg
- Regents of the University of California v. Bakke
- Reggae
- Reggaeton
- Reggio Calabria
- Reggio Emilia
- Regillus
- Regina, Saskatchewan
- Reginald Heber
- Reginald John Campbell
- Reginald Pecock
- Reginald Pole
- Reginald Stuart Poole
- Reginald Wingate
- Regino of Prüm
- Region of Murcia
- Region
- Regional geography
- Regional Italian
- Regions of Cameroon
- Regions of Chad
- Regions of Chile
- Regions of Denmark
- Regions of Ethiopia
- Regions of Finland
- Regions of France
- Regions of Guyana
- Regions of Iceland
- Regions of Iran
- Regions of Italy
- Regions of New Zealand
- Regions of Norway
- Regions of Peru
- Regions of the Czech Republic
- Regions of the Philippines
- Registan Desert
- Registan
- Register (music)
- Register (sociolinguistics)
- Regium Donum
- Regla
- Regolith
- Regression analysis
- Regret
- Regula falsi
- Regular dodecahedron
- Regular expression
- Regular graph
- Regular icosahedron
- Regular polygon
- Regular polyhedron
- Regular Show
- Regulation of chemicals
- Regulation of gene expression
- Regulation
- Regulatory agency
- Regulatory compliance
- Regulus
- Rehearsal
- Reichskammergericht
- Reichstag building
- Reichstag fire
- Reign of Terror
- Reims
- Rein
- Reincarnation
- Reindeer
- Reinforced concrete
- Reinhold Begas
- Reinhold Klotz
- Reinhold Pauli
- Reionization
- Reiyūkai
- Reizei Tamechika
- Rejection of evolution by religious groups
- Related rates
- Relationship between religion and science
- Relative atomic mass
- Relative dating
- Relative density
- Relative deprivation
- Relative permittivity
- Relativism
- Relativistic Breit–Wigner distribution
- Relativistic Doppler effect
- Relativistic Heavy Ion Collider
- Relativistic mechanics
- Relativistic quantum mechanics
- Relativity (M. C. Escher)
- Relativity of simultaneity
- Relativity: The Special and the General Theory
- Relay
- Relevance (law)
- Relic
- Relief carving
- Relief
- Religion in ancient Rome
- Religion in pre-Islamic Arabia
- Religion
- Religious art
- Religious conversion
- Religious denomination
- Religious ecstasy
- Religious experience
- Religious Jewish music
- Religious law
- Religious music
- Religious organization
- Religious philosophy
- Religious studies
- Religious violence
- Religious war
- Remaster
- Rembrandt
- Remediation of contaminated sites with cement
- Remembrancer
- Remineralisation
- Remingtonocetidae
- Reminiscence
- Remiremont
- Remmius Palaemon
- Remonstrants
- Remora
- Remote control
- Remote desktop software
- Remote job entry
- Remote sensing
- Remotely operated underwater vehicle
- Remphan
- Rémy Ceillier
- Rémy Joseph Isidore Exelmans
- Renaissance architecture in Central and Eastern Europe
- Renaissance architecture
- Renaissance art
- Renaissance literature
- Renaissance music
- Renaissance of the 12th century
- Renaissance philosophy
- Renaissance Revival architecture
- Renaissance technology
- Renaissance
- Renaud de Montauban
- Renault
- René Antoine Ferchault de Réaumur
- René Auguste Constantin de Renneville
- René Bazin
- René Caillié
- René Descartes
- René Doumic
- René Duguay-Trouin
- René Goblet
- René Just Haüy
- René Le Bossu
- René Nicolas Charles Augustin de Maupeou
- René of Anjou
- René-Marie Madec
- René-Michel Slodtz
- René-Robert Cavelier, Sieur de La Salle
- Renewable energy
- Renfe
- RENGO
- Renminbi
- Renn Hampden
- Rennes
- Reno, Nevada
- Rent (musical)
- Rep (fabric)
- Repeal
- Repeated game
- Repeating crossbow
- Repeating firearm
- Repenomamus
- Repentance in Christianity
- Reperfusion therapy
- Repetitive strain injury
- Replevin
- Replication crisis
- Repnin
- Reporters Without Borders
- Repoussé and chasing
- Repowering
- Representation theory
- Representative democracy
- Reprisal
- Reproducibility
- Reproduction
- Reproductive isolation
- Reproductive rights
- Reproductive system
- Reptile
- Reptiliomorpha
- Republic (Plato)
- Republic of Ancona
- Republic of Artsakh
- Republic of Crimea
- Republic of Florence
- Republic of Genoa
- Republic of Ireland
- Republic of Karelia
- Republic of Logone
- Republic of Pisa
- Republic of Ragusa
- Republic of Siena
- Republic of Texas
- Republic of the Congo
- Republic of Venice
- Republic
- Republican faction (Spanish Civil War)
- Republican Party (United States)
- Republika Srpska
- Requena, Valencia
- Requiem (Fauré)
- Requiem (Mozart)
- Requiem (Verdi)
- Requiem shark
- Requiem
- Resafa
- Reschen Pass
- Research and development
- Research
- Réseau Express Régional
- Resentment
- Reserve currency
- Reservoir Dogs
- Reservoir
- Residential area
- Residential gateway
- Residual media
- Residual-current device
- Residue (complex analysis)
- Residue theorem
- Resin
- Resistor
- Resolution (law)
- Resonance (chemistry)
- Resonance
- Resonator
- Resorcinol
- Resource allocation
- Resource war
- Resource
- Respect (song)
- Respect
- Respiration (physiology)
- Respirator
- Respiratory failure
- Respiratory rate
- Respiratory sounds
- Respiratory system
- Respiratory tract infection
- Resplendent quetzal
- Rest area
- Restoration ecology
- Restorationism
- Restorative justice
- Restoring force
- Restriction enzyme
- Reststrahlen effect
- Resultant force
- Resultant
- Résumé
- Resurrection of Jesus
- Resurrection
- Retable
- Retail
- Retarded time
- Retene
- Reticle
- Reticulated giraffe
- Reticulated python
- Reticulum
- Retina
- Retinite
- Retinue
- Retirement
- Retort
- Retreat (spiritual)
- Retrenchment
- Retriever
- Retro style
- Retrocognition
- Retrograde and prograde motion
- Retrosynthetic analysis
- Return of the Jedi
- Reuleaux triangle
- Reumont
- Réunion
- Reusability
- Reuters
- Revelation
- Revelations of Divine Love
- Revenant
- Revenge porn
- Revenue service
- Reverdy Johnson
- Reverse discrimination
- Reverse engineering
- Reverse genetics
- Reverse osmosis
- Reverse proxy
- Reverse transcriptase
- Reverse zoonosis
- Reversible process (thermodynamics)
- Reversible reaction
- Revillagigedo Islands
- Revised Version
- Revivalism (architecture)
- Revocation of the special status of Jammu and Kashmir
- Revolution
- Revolutionary Tribunal
- Revolutions of 1848
- Revolutions of 1917–1923
- Revolutions of 1989
- Revolutions per minute
- Revolver (Beatles album)
- Revolver
- Rewa district
- Rewa Kantha Agency
- Rewari
- Rex rabbit
- Reykjavík
- Reyn
- Reynolds number
- Reynosa
- Rēzekne
- RF and microwave filter
- RGB color model
- RGB color spaces
- Rh blood group system
- Rhabdocoela
- Rhaetic
- Rhamphorhynchus
- Rhampsinit
- Rhaphidophoridae
- Rhapsode
- Rhapsody (music)
- Rhapsody in Blue
- Rhapsody on a Theme of Paganini
- Rhea (bird)
- Rhea (moon)
- Rheic Ocean
- Rhein II
- Rhenium
- Rheology
- Rhesus macaque
- Rhetoric (Aristotle)
- Rhetoric
- Rheumatic fever
- Rheumatoid arthritis
- Rhianus
- Rhijnvis Feith
- Rhine Province
- Rhine-Ruhr
- Rhine–Main–Danube Canal
- Rhine
- Rhineland-Palatinate
- Rhineuridae
- Rhinoceros
- Rhinorrhea
- Rhinthon
- Rhizaria
- Rhizobia
- Rhizopus
- Rho Ophiuchi cloud complex
- Rhode Island Red
- Rhode Island
- Rhodes (city)
- Rhodes
- Rhodesia
- Rhodium
- Rhododendron
- Rhodonite
- Rhodopsin
- Rhoecus
- Rhombus
- Rhön Mountains
- Rhône-Alpes
- Rhône
- Rhotic consonant
- Rhoticity in English
- Rhubarb
- Rhumba
- Rhyme royal
- Rhyme
- Rhyming slang
- Rhynchobdellida
- Rhynchocephalia
- Rhynchocinetidae
- Rhynchosaur
- Rhyniophyte
- Rhyolite
- Rhythm and blues
- Rhythm
- RIA Novosti
- Rialto Bridge
- Riau Archipelago
- Riau Islands
- Riau
- Rib
- Ribaldry
- Ribbon diagram
- Ribbon eel
- Ribbon
- Ribbonfish
- Ribbonism
- Ribeauvillé
- Ribeirão Preto
- Ribes
- Riboflavin
- Ribose
- Ribosomal RNA
- Ribosome
- Riccoldo da Monte di Croce
- Rice University
- Rice's theorem
- Rice
- Ricefish
- Richard A. Proctor
- Richard Adelbert Lipsius
- Richard Airey, 1st Baron Airey
- Richard Alleine
- Richard Allestree
- Richard Andree
- Richard Ansdell
- Richard Avenarius
- Richard Baird Smith
- Richard Baker (chronicler)
- Richard Barham
- Richard Barnfield
- Richard Baxter
- Richard Beauchamp, 13th Earl of Warwick
- Richard Bentley
- Richard Bethell, 1st Baron Westbury
- Richard Blackmore
- Richard Brathwait
- Richard Brocklesby
- Richard Brome
- Richard Brothers
- Richard Bulstrode
- Richard Burn
- Richard Carlile
- Richard Challoner
- Richard Chenevix Trench
- Richard Church (general)
- Richard Claverhouse Jebb
- Richard Cobden
- Richard Congreve
- Richard Copley Christie
- Richard Courtenay
- Richard Cox (bishop)
- Richard Crashaw
- Richard Croker
- Richard Cumberland (philosopher)
- Richard de Bury
- Richard de la Pole
- Richard de Luci
- Richard Earlom
- Richard Edgcumbe, 1st Baron Edgcumbe
- Richard Elyot
- Richard Empson
- Richard Estcourt
- Richard Farrant
- Richard Fiddes
- Richard Flecknoe
- Richard François Philippe Brunck
- Richard Grant White
- Richard Grenville-Temple, 2nd Earl Temple
- Richard Guyon
- Richard Hakluyt
- Richard Hanson (Australian politician)
- Richard Hawkins
- Richard Heber
- Richard Henry Horne
- Richard Henry Stoddard
- Richard Hildreth
- Richard Holland
- Richard II (play)
- Richard III (play)
- Richard Jago
- Richard James Morrison
- Richard Johnson (16th century)
- Richard Kempenfelt
- Richard Kirwan
- Richard Lalor Sheil
- Richard Le Gallienne
- Richard Lovell Edgeworth
- Richard Lyons, 1st Viscount Lyons
- Richard Mansfield
- Richard March Hoe
- Richard Mather
- Richard Mead
- Richard Monckton Milnes, 1st Baron Houghton
- Richard Montagu
- Richard Neile
- Richard Nicolls
- Richard of Chichester
- Richard of Devizes
- Richard of Dover
- Richard of Hexham
- Richard of Ilchester
- Richard of Saint Victor
- Richard Offner
- Richard Olney
- Richard Owen Cambridge
- Richard Pace
- Richard Poore
- Richard Porson
- Richard Price
- Richard Quain
- Richard Rawlinson
- Richard Redgrave
- Richard Rich, 1st Baron Rich
- Richard Ros
- Richard Rothe
- Richard Rowlands
- Richard S. Ewell
- Richard Salter Storrs
- Richard Savage, 4th Earl Rivers
- Richard Shilleto
- Richard Strachey
- Richard T. Ely
- Richard Talbot, 1st Earl of Tyrconnell
- Richard Tangye
- Richard Tarlton
- Richard Valpy
- Richard Voss
- Richard Wagner
- Richard Wall
- Richard Watson Dixon
- Richard Webster, 1st Viscount Alverstone
- Richard Wellesley, 1st Marquess Wellesley
- Richard Westmacott
- Richard Whately
- Richard Whiteing
- Richard William Church
- Richard Wingfield
- Richardia
- Richerus
- Richmal Mangnall
- Richmond Mayo-Smith
- Richmond, Virginia
- Richneck Plantation
- Richter magnitude scale
- Ricimer
- Ricina
- Ricinulei
- Ricinus
- Rick and Morty
- Rickshaw Boy
- Rickshaw
- Riddle
- Ride of the Valkyries
- Rideau Canal
- Rideau, Cruchon et Compotier
- Ridge push
- Ridge
- Ridolfo Ghirlandaio
- Riebeckite
- Riemann hypothesis
- Riemann integral
- Riemann sphere
- Riemann sum
- Riemann surface
- Riemann zeta function
- Riemannian geometry
- Riesa
- Rieti
- Rievaulx
- Rif War
- Rifians
- Rifle
- Rifling
- Rift lake
- Rift Valley fever
- Rift valley
- Rift
- Riftia pachyptila
- Rig-e Jenn
- Riga
- Rigas Feraios
- Rigel
- Rigging
- Right angle
- Right ascension
- Right Ginza
- Right of asylum
- Right of self-defense
- Right to a fair trial
- Right to light
- Right to property
- Right to silence
- Right triangle
- Right whale dolphin
- Right whale
- Right-wing politics
- Rights
- Rigid airship
- Rigid body dynamics
- Rigid body
- Rigid rotor
- Rigoletto
- Rigord
- Rigpa
- Rigveda
- Rijksmuseum
- Rikken Kaishintō
- Rimini
- Rimmon
- Rin Tin Tin
- Ring (mathematics)
- Ring finger
- Ring flip
- Ring galaxy
- Ring Nebula
- Ring of Fire
- Ring spinning
- Ring system
- Ring theory
- Ring-goal
- Ring-opening polymerization
- Ring-tailed lemur
- Ringmaster (circus)
- Rings of Jupiter
- Rings of Neptune
- Rings of Saturn
- Rings of Uranus
- Ringtail
- Rinzai school
- Rio Branco, Acre
- Rio de Contas
- Rio de Janeiro (state)
- Rio de Janeiro Metro
- Rio de Janeiro
- Río de la Plata
- Río de Oro
- Río Gallegos, Santa Cruz
- Río Grande de Arecibo
- Rio Grande do Norte
- Rio Grande do Sul
- Río Grande, Tierra del Fuego
- Rio Grande
- Río Muni
- Rio Negro (Amazon)
- Río Negro Province
- Rio Tinto (corporation)
- Riobamba
- Riom
- Riot grrrl
- Riot
- Rip current
- Riparian zone
- Ripple marks
- Rise of nationalism in Europe
- Rise of nationalism in the Ottoman Empire
- Rishikesh
- Rishon LeZion
- Risk analysis (engineering)
- Risk assessment
- Riss glaciation
- Risso's dolphin
- Ritchey–Chrétien telescope
- Rite of passage
- Rites of Zhou
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- Ritual warfare
- Ritual
- Rivalry
- Rive-de-Gier
- River Avoca
- River Avon, Bristol
- River Barrow
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- River delta
- River dolphin
- River ecosystem
- River engineering
- River Forth
- River island
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- River morphology
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- River Severn
- River shark
- River Tees
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- River Tummel
- River Tyne
- River
- Riverboat
- Riverina
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- Riverside, California
- Rivet gun
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- Rivne Oblast
- Rivne
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- Riyad Pasha
- Riyadh Province
- Riyadh
- Rizalista religious movements
- Rizhao
- RMS Lusitania
- RNA interference
- RNA polymerase
- RNA splicing
- RNA
- Road junction
- Road roller
- Road transport
- Road
- Roadrunner
- Roald Amundsen
- Roanoke Colony
- Roanoke Island
- Roaring Twenties
- Rob Walker (journalist)
- Robbery
- Robe
- Robert Adamson (philosopher)
- Robert Alfred Cloyne Godwin-Austen
- Robert Anderson (editor and biographer)
- Robert Aytoun
- Robert Bailey Thomas
- Robert Bell (writer)
- Robert Bensley
- Robert Blair (poet)
- Robert Bloet
- Robert Bloomfield
- Robert Boyd, 1st Lord Boyd
- Robert Boyd, 5th Lord Boyd
- Robert Boyle
- Robert Brough
- Robert Bulwer-Lytton, 1st Earl of Lytton
- Robert Burnell
- Robert Cambert
- Robert Carey, 1st Earl of Monmouth
- Robert Charbonneau
- Robert Charnock
- Robert Christison
- Robert Clifford, 1st Baron Clifford
- Robert Clive
- Robert Collier, 1st Baron Monkswell
- Robert Colling
- Robert Collyer
- Robert Copland
- Robert Crannell Minor
- Robert Craufurd
- Robert Crewe-Milnes, 1st Marquess of Crewe
- Robert Dick
- Robert Dinwiddie
- Robert Dodsley
- Robert Dolling
- Robert Dudley Baxter
- Robert E. Lee Monument (Charlottesville, Virginia)
- Robert Eitner
- Robert Erskine Holland
- Robert Etheridge
- Robert Ferrar
- Robert Filmer
- Robert FitzStephen
- Robert Flint
- Robert Forman Horton
- Robert Fortune
- Robert Franz
- Robert Frederick Blum
- Robert Garnier
- Robert Gascoyne-Cecil, 3rd Marquess of Salisbury
- Robert Gillespie Reid
- Robert Gillow
- Robert Greville, 2nd Baron Brooke
- Robert Grosseteste
- Robert Groves Sandeman
- Robert Guiscard
- Robert Hamerling
- Robert Hampden-Trevor, 1st Viscount Hampden
- Robert Harkness
- Robert Harley, 1st Earl of Oxford and Earl Mortimer
- Robert Henry Anderson
- Robert Herbert Story
- Robert Hermann Schomburgk
- Robert I of France
- Robert I, Latin Emperor
- Robert III de La Marck
- Robert III of Scotland
- Robert J. Walker
- Robert Jamieson (antiquary)
- Robert Jenkins (master mariner)
- Robert Ker, 1st Earl of Roxburghe
- Robert Killigrew
- Robert Knolles
- Robert le Coq
- Robert le Maçon
- Robert Lindsay of Pitscottie
- Robert Liston
- Robert Louis Stevenson
- Robert Lowe
- Robert Lucas de Pearsall
- Robert Lundy
- Robert M. T. Hunter
- Robert Manwaring
- Robert McClure
- Robert Moberly (priest)
- Robert Montgomery (poet)
- Robert Morier
- Robert Nanteuil
- Robert Napier, 1st Baron Napier of Magdala
- Robert Naunton
- Robert Nicoll
- Robert Nugent, 1st Earl Nugent
- Robert O'Hara Burke
- Robert of Auxerre
- Robert of Torigni
- Robert Owen
- Robert Phillimore
- Robert Planquette
- Robert Plot
- Robert Pont
- Robert Porter Keep
- Robert Prutz
- Robert Rainy
- Robert Rawlinson
- Robert Recorde
- Robert Rich, 2nd Earl of Warwick
- Robert Richard Torrens
- Robert Rintoul
- Robert Rolfe, 1st Baron Cranworth
- Robert Rollock
- Robert Sale
- Robert Schindel
- Robert Sempill the younger
- Robert Sempill
- Robert Seppings
- Robert Sibbald
- Robert Sidney, 1st Earl of Leicester
- Robert Smirke (painter)
- Robert Smith (mathematician)
- Robert Smith Candlish
- Robert Smith Surtees
- Robert South
- Robert Spencer, 2nd Earl of Sunderland
- Robert Stewart, Viscount Castlereagh
- Robert Swain Gifford
- Robert Thoroton
- Robert Toombs
- Robert von Mohl
- Robert von Puttkamer
- Robert Vonnoh
- Robert Waithman
- Robert Walter Weir
- Robert Warburton
- Robert Wilberforce
- Robert Williams Buchanan
- Robert Winchelsey
- Robert Wodrow
- Robert Y. Hayne
- Robert-François Damiens
- Robert, 1st Earl of Gloucester
- Roberto di Ridolfo
- Robin Hood
- Robin Udal
- Robinia
- Robinson Crusoe
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- Robot Patent
- Robot
- Robotic arm
- Robotics
- Rocamadour
- Roche limit
- Roche lobe
- Rocher de Sel
- Rochester, New York
- Rochet
- Rock (geology)
- Rock and roll
- Rock Around the Clock
- Rock art
- Rock dove
- Rock magnetism
- Rock music
- Rock musical
- Rock-wallaby
- Rockefeller Center
- Rocker box
- Rocket engine
- Rocket-propelled grenade
- Rocket
- Rockwell B-1 Lancer
- Rocky Mountain National Park
- Rocky Mountains
- Rocky
- Rococo
- Rocroi
- Rod (unit)
- Rod cell
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- Roda Island
- Roden Noel
- Rodent
- Rodenticide
- Roderich Benedix
- Roderick Murchison
- Rodinia
- Rodolphe Kreutzer
- Rodolphe-Madeleine Cleophas Dareste de La Chavanne
- Rodomontade
- Rodrigo Calderón, Count of Oliva
- Rodrigo Cota de Maguaque
- Rodrigues
- Roe deer
- Roe v. Wade
- Roebourne, Western Australia
- Roentgen (unit)
- Roentgenium
- Roeselare
- Roger Ascham
- Roger Atkinson Pryor
- Roger Bacon
- Roger de Breteuil, 2nd Earl of Hereford
- Roger de Flor
- Roger de Rabutin, comte de Bussy
- Roger Dodsworth
- Roger Ducos
- Roger I of Sicily
- Roger II of Sicily
- Roger Joseph Boscovich
- Roger Kemble
- Roger L'Estrange
- Roger Marbeck
- Roger of Howden
- Roger of Lauria
- Roger of Salisbury
- Roger of Wendover
- Roger Q. Mills
- Roger Twysden
- Roger Walden
- Rogier van der Weyden
- Rogue planet
- Rogue wave
- Rogun Dam
- Rohilla
- Rohingya genocide
- Rohtak
- Roland Burrage Dixon
- Roland Laporte
- Roland
- Rolandseck
- Role model
- Role
- Roller (agricultural tool)
- Roller skating
- Rolling (metalworking)
- Rolling resistance
- Rolling stock
- Rolling Stone
- Rolling
- ROM image
- Roman art
- Roman Campagna
- Roman concrete
- Roman conquest of Britain
- Roman conquest of the Iberian Peninsula
- Roman Curia
- Roman de la Rose
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- Roman festivals
- Roman Forum
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- Roman numerals
- Roman Republic
- Roman Rota
- Roman–Persian Wars
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- Romance of the Three Kingdoms
- Romance of Thebes
- Romanesque architecture
- Romanesque art
- Romani Holocaust
- Romani people
- Romania in World War I
- Romania
- Romanian architecture
- Romanian Carpathians
- Romanian language
- Romanian literature
- Romanian Revolution
- Romanization of Arabic
- Romanization of Chinese
- Romanization of Japanese
- Romanization
- Romanos I Lekapenos
- Romanos II
- Romanos III Argyros
- Romanos IV Diogenes
- Romansh language
- Romanshorn
- Romantic music
- Romanticism in science
- Romanticism
- Rome Metro
- Rome
- Romeo and Juliet (Prokofiev)
- Romeo and Juliet (Tchaikovsky)
- Romeo and Juliet
- Romesh Chandra Mitra
- Romorantin
- Romulus and Remus
- Ronald Firbank
- Roncesvalles
- Rondônia
- Rongorongo
- Ronsdorf
- Rood (unit)
- Rood
- Roof shingle
- Roof
- Rook (bird)
- Room
- Roorkee
- Root canal treatment
- Root canal
- Root of unity
- Root-finding algorithms
- Root
- Roots (1977 miniseries)
- Roots: The Saga of an American Family
- Rope
- Roquelaure
- Roraima
- Rosa Luxemburg
- Rosa multiflora
- Rosa Parks
- Rosa Sucher
- Rosaceae
- Rosalinda (Mexican TV series)
- Rosario de Acuña
- Rosario, Santa Fe
- Rosary
- ROSAT
- Roscellinus
- Roscoff
- Roscosmos
- Rose Coghlan
- Rose Hartwick Thorpe
- Rose oil
- Rose Terry Cooke
- Rose window
- Rose
- Roseanne
- Roseau
- Rosella
- Rosemary Park
- Rosemary's Baby (film)
- Rosemary
- Rosetta Stone
- Rosette Nebula
- Rosh Hashanah
- Rosicrucianism
- Rosin
- Ross Dependency
- Ross Ice Shelf
- Ross Sea
- Rossano
- Rossiyskaya Gazeta
- Roßlau
- Roßwein
- Rostock
- Rostov-on-Don
- Rostrevor
- Roswell Dwight Hitchcock
- Rotary cannon
- Rotary switch
- Rotation (mathematics)
- Rotation formalisms in three dimensions
- Rotation of ammunition
- Rotation
- Rotational spectroscopy
- Rotational–vibrational spectroscopy
- Rotations in 4-dimensional Euclidean space
- Rothaar Mountains
- Rothenburg ob der Tauber
- Rotifer
- Rotorcraft
- Rotten Tomatoes
- Rotterdam Metro
- Rotterdam
- Rottweiler
- Rotuma
- Roualeyn George Gordon-Cumming
- Roudnice nad Labem
- Rouen
- Rougarou
- Rough Collie
- Rough-skinned newt
- Roughcast
- Roundhay Garden Scene
- Roundness (geology)
- Roundsman System
- Rourkela
- Rous sarcoma virus
- Roussillon
- Route from the Varangians to the Greeks
- Route of administration
- Router (computing)
- Routing
- Rove beetle
- Rovereto
- Rovinj
- Rowan & Martin's Laugh-In
- Rowlock
- Roxburghshire
- Roxelana
- Roxolani
- Roy W. Howard
- Royal Academy of Arts
- Royal Alberta Museum
- Royal Botanical Gardens, Peradeniya
- Royal Canadian Mounted Police
- Royal charter
- Royal College of Surgeons of Edinburgh
- Royal Crown Derby
- Royal forest
- Royal household
- Royal Humane Society
- Royal Library, Denmark
- Royal National Park
- Royal Niger Company
- Royal Ontario Museum
- Royal prerogative
- Royal sign-manual
- Royal Society for the Prevention of Cruelty to Animals
- Royal Society
- Royal Tyrrell Museum of Palaeontology
- Royan
- Royat
- Roystonea oleracea
- Roystonea regia
- Roystonea
- Rozvi Empire
- RR Lyrae variable
- RS-232
- RSA (cryptosystem)
- RT (TV network)
- RTHK
- Ruabon
- Ruacana Hydroelectric Power Station
- Rub' al Khali
- Rubaiyat of Omar Khayyam
- Rubber bullet
- Rubble
- Rubella
- Rubellite
- Rubia tinctorum
- Rubiaceae
- Rubidium–strontium dating
- Rubidium
- Rubin–Ford effect
- Rubric
- Ruby (programming language)
- Ruby laser
- Ruby McKim
- Ruby slippers
- Ruby
- Rudaki
- Ruderal species
- Rudists
- Rudok
- Rudolf Baumbach
- Rudolf Carl von Slatin
- Rudolf Carnap
- Rudolf Christoph Eucken
- Rudolf Haym
- Rudolf I of Germany
- Rudolf Jakob Camerarius
- Rudolf Virchow
- Rudolf von Bennigsen
- Rudolf von Delbrück
- Rudolf von Gneist
- Rudolf von Gottschall
- Rudolf von Jhering
- Rudolf Wagner
- Rudolf Westphal
- Rudolph Koenig
- Rudolph Schadow
- Rudolstadt
- Rufane Shaw Donkin
- Ruff (bird)
- Ruffed lemur
- Rufous hummingbird
- Rufus Choate
- Rufus Wilmot Griswold
- Rügen
- Ruggero Bonghi
- Rugrats
- Ruhla
- Ruhrort
- Rui de Pina
- Rukwa Region
- Rule in Shelley's Case
- Rule of division (combinatorics)
- Rule of inference
- Rule of law
- Rule of lenity
- Rule of product
- Rule of Saint Benedict
- Rule utilitarianism
- Rule, Britannia!
- Rulemaking
- Ruler
- Ruling class
- Rum (endonym)
- Rumex hymenosepalus
- Rumi
- Ruminant
- Rumours (album)
- Rundale
- Rundlet
- Runes
- Runge–Kutta methods
- Runnymede
- Runway
- Ruodlieb
- Rūpa
- Rupert Alfred Kettle
- Rupnagar
- Rural area
- Rurik dynasty
- Rus' people
- Ruse, Bulgaria
- Rusellae
- Russeifa
- Russell Sage
- Russell Sturgis
- Russell's paradox
- Russell's teapot
- Russet Burbank
- Russia-1
- Russia
- Russian architecture
- Russian Arctic National Park
- Russian Armed Forces
- Russian ballet
- Russian Blue
- Russian Civil War
- Russian colonization of North America
- Russian conquest of Central Asia
- Russian conquest of Siberia
- Russian Empire
- Russian entry into World War I
- Russian famine of 1921–1922
- Russian Far East
- Russian language
- Russian literature
- Russian mafia
- Russian Museum
- Russian Orthodox Church
- Russian Railways
- Russian Revolution
- Russian ruble
- Russian State Library
- Russification of Finland
- Russky Island
- Russo-Georgian War
- Russo-Japanese War
- Russo-Kazan Wars
- Russo-Polish War (1654–1667)
- Russo-Turkish War (1787–1792)
- Russo-Turkish War (1877–1878)
- Russo-Ukrainian War
- Rust (fungus)
- Rust Belt
- Rust
- Rustenburg
- Rustic architecture
- Rutabaga
- Rutan Voyager
- Rutebeuf
- Rutgers University
- Ruth (biblical figure)
- Ruthenia
- Ruthenium
- Rutherford Alcock
- Rutherford B. Hayes
- Rutherford model
- Rutherford scattering
- Rutherfordium
- Rutilius Claudius Namatianus
- Rutland
- Rutuli
- Ruvuma River
- Ruwais
- Rwanda
- Rwandan Civil War
- Rwandan genocide
- Rwandan Revolution
- Rwenzori Mountains
- RWTH Aachen University
- Ryanair
- Ryanggang Province
- Ryazan
- Ryazhsk
- Rydberg formula
- Rye
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- Ryukyu Islands
- Ryukyu Kingdom
- Ryukyuan languages
- Ryukyuan people
- Ryūnosuke Akutagawa
- Rzeszów
- Rzhev
- S wave
- S-Bahn
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- S-type star
- S. R. Crockett
- Saadia Gaon
- Saale
- Saalfeld
- Saana
- Saarbrücken
- Saaremaa
- Saarland
- Šabac
- Sabadell
- Sábado Gigante
- Sabaeans
- Sabah
- Sabal
- Sabbas
- Sabbatai Zevi
- Sabbath
- Sabbioneta
- Sabellius
- Saber-toothed predator
- Sabha, Libya
- Sabicu wood
- Sable
- Sabot (firearms)
- Sabotage
- Sabre (fencing)
- Sabre
- Sabzevar
- Saccharic acid
- Saccharomyces cerevisiae
- Sacerdotalism
- Sack (unit)
- Sackets Harbor, New York
- Saco, Maine
- Sacral architecture
- Sacrament of Penance
- Sacrament
- Sacramental
- Sacramentarians
- Sacramento River
- Sacramento, California
- Sacred dance
- Sacred space
- Sacred tradition
- Sacredness
- Sacrifice
- Sadamisaki Peninsula
- Saddle point
- Saddle
- Sadh
- Sadi Carnot (statesman)
- Sadistic personality disorder
- Sadiya
- Sadness
- Sado, Niigata
- Sadová
- Saepinum
- Safavid conversion of Iran to Shia Islam
- Safavid dynasty
- Safety data sheet
- Safety glass
- Safety lamp
- Safety razor
- Safety
- Saffarid dynasty
- Saffir–Simpson scale
- Safflower
- Saffron
- Safi, Morocco
- Safranin
- Safrole
- Saga (city)
- Saga Prefecture
- Saga
- Sagallo
- Sagami Bay
- Sagamihara
- Sagar Island
- Sagitta
- Sagittarius (constellation)
- Sagittarius A
- Sagittarius A*
- Sagittarius B2
- Sagittarius Dwarf Spheroidal Galaxy
- Sagrada Família
- Saguaro National Park
- Saguenay River
- Sahand
- Sahara
- Saharanpur
- Sahasranama
- Sahel
- Sahelanthropus
- Sahelian kingdoms
- Sahib
- Sahiwal
- Saho people
- Sahrawi Arab Democratic Republic
- Said Pasha Kurd
- Saidapet
- Saiga antelope
- Sail
- Sailboat
- Sailcloth
- Sailfish
- Sailing ship tactics
- Sailing ship
- Sailing
- Sailor Moon (character)
- Sailor Moon
- Saimaa
- Saint Anthony Falls
- Saint Barthélemy
- Saint Basil's Cathedral
- Saint Blane
- Saint Boniface
- Saint Catherine's Monastery
- Saint Croix
- Saint Fiacre
- Saint Hugh
- Saint John River (Bay of Fundy)
- Saint John, New Brunswick
- Saint Kilian
- Saint Kitts and Nevis
- Saint Kitts
- Saint Louis Blues (song)
- Saint Lucia
- Saint Martin (island)
- Saint Mungo
- Saint Nicholas
- Saint Patrick's Day
- Saint Paul, Minnesota
- Saint Peter and Saint Paul Archipelago
- Saint Petersburg Metro
- Saint Petersburg State University
- Saint Petersburg
- Saint Pierre and Miquelon
- Saint Remigius
- Saint Roch
- Saint Sylvester's Day
- Saint Timothy
- Saint Vincent (Antilles)
- Saint Vincent and the Grenadines
- Saint Vincent Bay
- Saint Yon
- Saint-Affrique
- Saint-Denis, Réunion
- Saint-Denis, Seine-Saint-Denis
- Saint-Dié-des-Vosges
- Saint-Dizier
- Saint-Étienne
- Saint-Girons, Ariège
- Saint-Hyacinthe
- Saint-Lô
- Saint-Louis, Senegal
- Saint-Macaire
- Saint-Maixent
- Saint-Maur-sur-Loire
- Saint-Mihiel
- Saint-Nectaire, Puy-de-Dôme
- Saint-Omer
- Saint-Pierre, Saint Pierre and Miquelon
- Saint-René Taillandier
- Saint-Servan
- Saint-Sever
- Saint
- Sainte-Anne-de-Beaupré
- Sainte-Marie-aux-Mines
- Saintes-Maries-de-la-Mer
- Saipan
- Saitama (city)
- Saitama Prefecture
- Saka
- Sakai
- Sakha
- Sakhalin
- Sakoku
- Sakshi (newspaper)
- Sakuma Shōzan
- Sakurajima
- Sakya
- Salaberry-de-Valleyfield
- Salado Formation
- Salafi movement
- Salah
- Salalah
- Salamander
- Salaminia
- Salamis Island
- Salar Jung family
- Salary
- Salas
- Salbutamol
- Saldanha Bay
- Saldidae
- Salé
- Saleius Bassus
- Salem witch trials
- Salem, Massachusetts
- Salem, Oregon
- Salem, Tamil Nadu
- Salento
- Salep
- Salerno
- Salers
- Sales tax
- Sales
- Salghurids
- Salic law
- Salicylic acid
- Salimbene di Adam
- Salina Cruz
- Salins-les-Bains
- Salish Sea
- Saliva
- Salivary gland
- Sallarid dynasty
- Sallet
- Sallust
- Salmeterol
- Salmon Levinson
- Salmon P. Chase
- Salmon
- Salmonella
- Salmonidae
- Salomo Glassius
- Salomon August Andrée
- Salomon Gessner
- Salomon Maimon
- Salomon Reinach
- Salonga National Park
- Salp
- Salsa (dance)
- Salsa music
- Salsette Island
- Salsomaggiore Terme
- Salt (chemistry)
- Salt bridge
- Salt cellar
- Salt Lake City
- Salt lake
- Salt March
- Salt marsh
- Salt metathesis reaction
- Salt mining
- Salt pan (geology)
- Salt Range
- Salt
- Salta Province
- Salta
- Saltasauridae
- Saltburn-by-the-Sea
- Saltillo
- Salting (union organizing)
- Salto, Uruguay
- Salton Sea
- Saltwater crocodile
- Salutation
- Salvador, Bahia
- Salvage Corps
- Salvation
- Salvator Mundi (Leonardo)
- Salvator Rosa
- Salvatore Farina
- Salver
- Salvia hispanica
- Salvia officinalis
- Salvia
- Salvian
- Salviniales
- Salween River
- Salyan, Azerbaijan
- Salyes
- Salyut 1
- Salzburg (state)
- Salzburg
- Salzkammergut
- Samana Range
- Samanea saman
- Samanid Empire
- Samar
- Samara
- Samaria (ancient city)
- Samarinda
- Samarium
- Samarkand
- Samatha
- Samba (Brazilian dance)
- Samba
- Sambalpur
- Sambation
- Sambhar Salt Lake
- Saṃbhogakāya
- Samblançay
- Sambucus
- Samguk Sagi
- Samguk yusa
- Samhain
- Sami Frashëri
- Sámi
- Samjna (concept)
- Samoa
- Samoan Civil War
- Samoan crisis
- Samoan Islands
- Samoan language
- Samos
- Samosir
- Sampierdarena
- Sample mean and covariance
- Sample space
- Sampler (musical instrument)
- Sampling (signal processing)
- Sampling (statistics)
- Sampling error
- Saṃsāra
- Samson
- Samsun
- Samsung
- Samuel Ajayi Crowther
- Samuel Allport
- Samuel Amsler
- Samuel Austin Allibone
- Samuel Ayscough
- Samuel Baker
- Samuel Birch
- Samuel Bochart
- Samuel Bowles (journalist)
- Samuel Brown (engineer)
- Samuel Butler (schoolmaster)
- Samuel Carter Hall
- Samuel Chandler
- Samuel Colman
- Samuel Cousins
- Samuel Crompton
- Samuel Dana Horton
- Samuel Daniel
- Samuel David Luzzatto
- Samuel Davidson
- Samuel de Champlain
- Samuel Dirksz van Hoogstraten
- Samuel Drew
- Samuel Foote
- Samuel Gobat
- Samuel Gorton
- Samuel Griswold Goodrich
- Samuel Hanson Cox
- Samuel Haughton
- Samuel Hearne
- Samuel Heinicke
- Samuel Hood, 1st Viscount Hood
- Samuel Horsley
- Samuel J. Randall
- Samuel Jones-Loyd, 1st Baron Overstone
- Samuel Lister, 1st Baron Masham
- Samuel Lovett Waldo
- Samuel Morison Brown
- Samuel Morse
- Samuel Musgrave
- Samuel of Nehardea
- Samuel Penhallow
- Samuel Phelps
- Samuel Prideaux Tregelles
- Samuel Purchas
- Samuel Rawson Gardiner
- Samuel Rolles Driver
- Samuel Romilly
- Samuel Rowlands
- Samuel Rutherford
- Samuel Seabury
- Samuel Sebastian Wesley
- Samuel Stehman Haldeman
- Samuel Tuke (reformer)
- Samuel von Pufendorf
- Samuel Warren (British lawyer)
- Samuel Wesley
- Samuel Wilberforce
- Samuel Woodward
- Samuel
- Samuele Romanin
- Samurai Champloo
- Samurai
- San Andreas Fault
- San Antonio de los Baños
- San Antonio
- San Benedetto dei Marsi
- San Cristóbal de La Laguna
- San Cristóbal, Táchira
- San Diego
- San Fernando, Chile
- San Fernando, Trinidad and Tobago
- San Francisco Ballet
- San Francisco Bay Area
- San Francisco Bay
- San Francisco Chronicle
- San Francisco Peninsula
- San Francisco–Oakland Bay Bridge
- San Francisco
- San Germán, Puerto Rico
- San Joaquin River
- San Jose, California
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- San Juan Islands
- San Juan Province, Argentina
- San Juan, Metro Manila
- San Juan, Puerto Rico
- San Lorenzo, Paraguay
- San Luis Potosí City
- San Luis Potosí
- San Luis Province
- San Marco d'Alunzio
- San Marino
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- San Miguel, Bulacan
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- San Miniato
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- San people
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- San Severo
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- Sancho Ordóñez
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- Sanctions (law)
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- Sanctuary of Our Lady of Lourdes
- Sand art and play
- Sand casting
- Sand dollar
- Sand shark
- Sand tiger shark
- Sand
- Sandarac
- Sandblasting
- Sandfly
- Sandglass (TV series)
- Sandgrouse
- Sandhi
- Sándor Kőrösi Csoma
- Sándor Wekerle
- Sandpainting
- Sandpiper
- Sandstone
- Sandy Cape
- Sandy Hook Elementary School shooting
- Sanford Robinson Gifford
- Sanford Wallace
- Sangam literature
- Sangerhausen
- Sangha
- Sangli-Miraj & Kupwad
- Sango language
- Sanhedrin
- Sanitary engineering
- Sanitary sewer
- Sanitation
- Sanjna
- Sanjō Sanetomi
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- Sankt Goar
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- Sansepolcro
- Sanshui District
- Sanskrit
- Santa Ana, California
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- Santa Barbara (TV series)
- Santa Catarina (state)
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- Seabed
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- Sears
- Season extension
- Season of Migration to the North
- Season
- Seasonal affective disorder
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- Sedimentary basin analysis
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- Self-defeating personality disorder
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- Self-Portrait as the Allegory of Painting
- Self-Portrait with Thorn Necklace and Hummingbird
- Self-portraits by Rembrandt
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- Sequence
- Sequential bilingualism
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- Sergipe
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- Serial (podcast)
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- Serial ATA
- Serial comma
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- Serial Experiments Lain
- Serial killer
- Serial rapist
- Serialism
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- Seriema
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- Serine
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- Sermon
- Serow
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- Serranidae
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- Service design
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- Service tree
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- Sesame Street
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- Session Initiation Protocol
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- Set theory
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- Settling
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- Seven Years' War
- Seventeen (American magazine)
- Seventeen Moments of Spring
- Seventeen tantras
- Seventh generation of video game consoles
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- Sewing
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- Sextans
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- Sexual and reproductive health
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- Sexual dimorphism
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- Sexual intercourse
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- Sexual revolution
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- Seychelles
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- Sgt. Pepper's Lonely Hearts Club Band
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- Shape
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- Shapley Supercluster
- Shapur I
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- Shapur III
- Share taxi
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- Shared-use path
- Shareholder
- Sharia
- Sharif
- Sharjah
- Shark
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- Sharovipteryx
- Sharp (music)
- Sharqia Governorate
- Shatt al-Arab
- Shaving cream
- Shaving
- Shavuot
- Shawnee
- Shays' Rebellion
- Shchedryk (song)
- She: A History of Adventure
- Sheaf (mathematics)
- Shear (geology)
- Shear modulus
- Shear stress
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- Shebaa Farms
- Sheberghan
- Shebuel
- Sheep dog
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- Sheep
- Sheerah
- Sheet metal
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- Sheffer stroke
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- Shell plc
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- Sher Ali Khan
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- Sheridan Le Fanu
- Sheriff
- Sheriffmuir
- Sherlock (TV series)
- Sherlock Holmes
- Sherwood Forest
- Shetland pony
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- Shia Islam
- Shiba Inu
- Shibpur
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- Shidvar Island
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- Shield mantis
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- Shield
- Shifnal
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- Shiga Prefecture
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- Shiitake
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- Shijingshan District
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- Shikoku
- Shildon
- Shilha people
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- Shimane Prefecture
- Shimeji
- Shimla
- Shimoga
- Shimokita Peninsula
- Shimon bar Yochai
- Shimonoseki
- Shinasha people
- Shindand
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- Ship money
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- Shipibo-Conibo
- Shipka Pass
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- Shirakawa, Gifu (village)
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- Shizuoka (city)
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- Shlisselburg
- Shoah (film)
- Shoal
- Shock (circulatory)
- Shock (mechanics)
- Shock absorber
- Shock wave
- Shoebill
- Shofar
- Shogi
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- Sholay
- Shona language
- Shonisaurus
- Shooting method
- Shoplifting
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- Shore
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- Short ton
- Shortest path problem
- Shorthand
- Shorthorn
- Shortland Street
- Shortwave radio
- Shoshone
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- Shot (pellet)
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- Shotgun
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- Shreveport, Louisiana
- Shrew
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- Shrimp
- Shrimpfish
- Shrinathji
- Shrine
- Shriners
- Shringasaurus
- Shropshire
- Shroud of Turin
- Shrub
- Shrubland
- Shu Han
- Shubra El Kheima
- Shuffleboard
- Shuga (TV series)
- Shuiding
- Shukriya
- Shumen
- Shunde District
- Shuriken
- Shusha
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- Shuttle (weaving)
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- Shwebo
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- Shymkent
- Shyness
- Shyok River
- Si-o-se-pol
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- Sibawayh
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- Šibenik
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- Siberian crane
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- Siberian tiger
- Siberian Traps
- Sibi
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- Sicana odorifera
- Sicani
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- Sicilian Expedition
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- Side chain
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- Sidney Herbert, 1st Baron Herbert of Lea
- Sidney Shippard
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- Sidney Sonnino
- Sidneyia
- Sidon
- Sidonius Apollinaris
- SIDS
- Siebengebirge
- Siege engine
- Siege of Acre (1189–1191)
- Siege of Acre (1291)
- Siege of Antioch
- Siege of Baghdad (1258)
- Siege of Belgrade (1456)
- Siege of Carthage (Third Punic War)
- Siege of Charleston
- Siege of Constantinople (674–678)
- Siege of Constantinople (717–718)
- Siege of Jerusalem (1099)
- Siege of Jerusalem (1187)
- Siege of Leningrad
- Siege of Lucknow
- Siege of Malta (World War II)
- Siege of Metz (1870)
- Siege of Orléans
- Siege of Paris (1870–1871)
- Siege of Pavia (773–774)
- Siege of Pembroke
- Siege of Petersburg
- Siege of Sarajevo
- Siege of Sevastopol (1854–1855)
- Siege of Turin
- Siege of Vicksburg
- Siege of Yorktown
- Siege tower
- Siege
- Siegfried (opera)
- Siegfried
- Siem Reap
- Siemens (unit)
- Siemens Mobility
- Siemianowice Śląskie
- Siena
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- Sierra Leone Civil War
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- Sieve of Eratosthenes
- Sieve
- Sievert
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- Sigfrid Siwertz
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- Sight (device)
- Sigiriya
- Sigismund Báthory
- Sigismund II Augustus
- Sigma bond
- Sigmund Freud
- Sign (mathematics)
- Sign function
- Sign language
- Sign o' the Times
- Sign
- Signage
- Signal processing
- Signal transduction
- Signal-to-noise ratio
- Signaling (telecommunications)
- Signature (logic)
- Significs
- Signs and symptoms
- Sigurd
- Sigynnae
- Sihanoukville (city)
- Sijilmasa
- Sika deer
- Sikaiana
- Sikasso
- Sikh architecture
- Sikh Empire
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- Sikhism
- Sikhote-Alin
- Sikkim
- Silage
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- Silent Night
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- Silesauridae
- Silesia
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- Silhouette
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- Silicon Valley
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- Silifke
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- Silk Road
- Silk
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- Silla
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- Silo
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- Silures
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- Silver (color)
- Silver azide
- Silver bromide
- Silver carp
- Silver coin
- Silver iodide
- Silver mining
- Silver nitrate
- Silver nitride
- Silver-gilt
- Silver
- Silverfish
- Silviculture
- Silvio Pellico
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- Simchat Torah
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- Simferopol
- Similarity (geometry)
- Simmental cattle
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- Simón Bolívar
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- Simon Caboche
- Simon de Montfort, 6th Earl of Leicester
- Simon Episcopius
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- Simon Grynaeus
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- Simon's Town
- Simone Antonio Saint-Bon
- Simone Cantarini
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- Simoom
- Simosuchus
- Simple harmonic motion
- Simple machine
- Simple Mail Transfer Protocol
- Simple programmable logic device
- Simplex algorithm
- Simplicius of Cilicia
- Simplified Chinese characters
- Simpson Desert
- Simri
- Sims Reeves
- Sin (mythology)
- Sin
- Sina Weibo
- Sinai and Palestine campaign
- Sinai Peninsula
- Sinaia Monastery
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- Sinaloa
- Sinapis arvensis
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- Sinbad the Sailor
- Sindh
- Sindhi language
- Sine and cosine
- Sing, Sing, Sing (With a Swing)
- Singanallur
- Singapore Airlines
- Singapore Art Museum
- Singapore in Malaysia
- Singapore River
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- Singapore
- Singer-songwriter
- Singhbhum district
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- Singing
- Singitic Gulf
- Single bond
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- Singles' Day
- Singlestick
- Singlet oxygen
- Singularity (mathematics)
- Sinhala language
- Sink
- Sinkhole
- Sinking of the Rainbow Warrior
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- Sinking of the Titanic
- Sinner's prayer
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- Sino-Soviet split
- Sino-Tibetan languages
- Sinopec
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- Sintering
- Sinterklaas
- Sintra
- Sion College
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- Sioux Wars
- Sioux
- Siphon
- Siphonophorae
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- Sippai
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- Sir Alexander Cockburn, 12th Baronet
- Sir Charles Palmer, 1st Baronet
- Sir Charles Sedley, 5th Baronet
- Sir Donald Stewart, 1st Baronet
- Sir Gawain and the Green Knight
- Sir George Cockburn, 10th Baronet
- Sir George Downing, 1st Baronet
- Sir George Stokes, 1st Baronet
- Sir George Trevelyan, 2nd Baronet
- Sir Gilbert Parker, 1st Baronet
- Sir Harry Smith, 1st Baronet
- Sir Henry Rawlinson, 1st Baronet
- Sir James Graham, 2nd Baronet
- Sir James Outram, 1st Baronet
- Sir John Acton, 6th Baronet
- Sir John Barrow, 1st Baronet
- Sir John Duckworth, 1st Baronet
- Sir John Sinclair, 1st Baronet
- Sir John Wynn, 1st Baronet
- Sir John Wynn, 5th Baronet
- Sir Joseph Robinson, 1st Baronet
- Sir Owen Wynn, 3rd Baronet
- Sir Philip Grey Egerton, 10th Baronet
- Sir Richard Griffith, 1st Baronet
- Sir Richard Hoare, 2nd Baronet
- Sir Richard Wynn, 2nd Baronet
- Sir Richard Wynn, 4th Baronet
- Sir Thomas Blount, 1st Baronet
- Sir Thomas Munro, 1st Baronet
- Sir Thomas Troubridge, 1st Baronet
- Sir Watkin Williams-Wynn, 3rd Baronet
- Sir William Anson, 3rd Baronet
- Sir William Fergusson, 1st Baronet
- Sir William Hamilton, 9th Baronet
- Sir William Jenner, 1st Baronet
- Sir William Martin, 4th Baronet
- Sir William Stirling-Maxwell, 9th Baronet
- Sir
- Sirajganj
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- Sistan
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- Sistine Chapel ceiling
- Sistine Chapel
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- Sitcom
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- Sivas
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- Siwa Oasis
- Siward, Earl of Northumbria
- Six Characters in Search of an Author
- Six Dharmas of Naropa
- Six Dynasties
- Six Feet Under (TV series)
- Six-Day War
- Sixel
- Sixteen Kingdoms
- Sixth generation of video game consoles
- Siyi
- Size
- Sizing
- Ska
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- Skandha
- Skara Brae
- Skate (fish)
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- Skeletal muscle
- Skeleton key
- Skeleton
- Skelton and Brotton
- Skepticism
- Sketch comedy
- Skew lines
- Skewness
- Ski lift
- Skiathos
- Skill
- Skin cancer
- Skin condition
- Skin infection
- Skin temperature
- Skin
- Skinhead
- Skink
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- Skipjack tuna
- Skolem normal form
- Skolem's paradox
- Skopje
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- Skrzynecki
- Skua
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- Sky blue
- Sky brightness
- Sky deity
- Sky Tower (Auckland)
- Sky
- Skylab
- Skyline
- Skype
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- SkyTrain (Vancouver)
- Slab (geology)
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- Slang
- Slaný
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- Slate (magazine)
- Slate gray
- Slate
- Slaughterhouse-Five
- Slaughterhouse
- Slave Craton
- Slave River
- Slavery in Africa
- Slavery in the United States
- Slavery
- Slavic languages
- Slavic migrations to the Balkans
- Slavic paganism
- Slavonic Dances
- Slavs
- Sled
- Sleep apnea
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- Sleep in animals
- Sleep
- Sleeping Beauty
- Sleeping Hermaphroditus
- Sleeve
- Sleight of hand
- Sleipnir
- Slime mold
- Slimehead
- Sling (weapon)
- Slingshot
- Slipper lobster
- Sloan Digital Sky Survey
- Slonim
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- Sloth
- Slovak language
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- Slovakia
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- Slype
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- Small intestine
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- Small modular reactor
- Small talk
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- Smallpox
- Smallwood Reservoir
- Smaltite
- Smart grid
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- Smarta tradition
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- Smederevo
- Smelling salts
- Smells Like Teen Spirit
- Smelt (fish)
- Smelting
- Smiley
- Smilodon
- Smiths Falls
- Smithson Tennant
- Smithsonian (magazine)
- Smithsonian American Art Museum
- Smithsonian Institution
- Smog
- Smohalla
- Smoke and mirrors
- Smokeless powder
- Smoking pipe
- Smoking
- Smolensk Upland
- Smooth muscle
- Smooth-coated otter
- Smoothness
- Smother crop
- SMS language
- SMS
- Smudge pot
- Smuggling
- Smyth
- SN 1054
- SN 1572
- SN 1972E
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- SN1 reaction
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- SNAC
- Snail
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- Snake lemma
- Snake River
- Snake worship
- Snake
- Snakebite
- Snakefly
- Snakeroot
- Snap pea
- Snapchat
- Snare drum
- Snark (graph theory)
- SNCF
- Sneeze
- Snell's law
- Sněžka
- SNi
- Snip-Snap-Snorum
- Snipe eel
- Snipe
- Sniper rifle
- Sniper
- Snorkel (swimming)
- Snorri Sturluson
- Snow Country
- Snow goose
- Snow leopard
- Snow line
- Snow pea
- Snow Storm: Steam-Boat off a Harbour's Mouth
- Snow White and the Seven Dwarfs (1937 film)
- Snow White
- Snow
- Snowball Earth
- Snowdonia
- Snowmobile
- Snowshoe hare
- Snowshoe
- Snowsquall
- Snowy owl
- Soame Jenyns
- Soap Box Derby
- Soap opera
- Soap
- Sobat River
- Sobek
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- Sobraon
- Sobriquet
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- Sochi
- Social anthropology
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- Socialism
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- Socinianism
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- Sociological theory
- Sociology
- Socotra
- Socrates
- Socratic method
- Soda–lime glass
- Södertälje Municipality
- Sodium acetate
- Sodium azide
- Sodium benzoate
- Sodium bicarbonate
- Sodium borohydride
- Sodium calcium edetate
- Sodium carbonate
- Sodium chloride
- Sodium chromate
- Sodium citrate
- Sodium cyanide
- Sodium decavanadate
- Sodium dichromate
- Sodium dithionite
- Sodium ferrocyanide
- Sodium hydride
- Sodium hydroxide
- Sodium hypochlorite
- Sodium metaborate
- Sodium metavanadate
- Sodium nitrate
- Sodium nitrite
- Sodium orthovanadate
- Sodium oxide
- Sodium perchlorate
- Sodium permanganate
- Sodium peroxide
- Sodium silicate
- Sodium sulfate
- Sodium sulfide
- Sodium superoxide
- Sodium thioantimoniate
- Sodium thiosulfate
- Sodium
- Sodom and Gomorrah
- Sof Omar Caves
- Soffioni
- Soffit
- Sofia
- Sofonisba Anguissola
- Soft hyphen
- Soft matter
- Soft-sediment deformation structures
- SoftBank Group
- Softmodem
- Software and Information Industry Association
- Software bug
- Software design
- Software development kit
- Software development
- Software documentation
- Software engineering
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- Software portability
- Software prototyping
- Software release life cycle
- Software testing
- Software-defined radio
- Software
- Sofya Kovalevskaya
- Sogdia
- Sogdian art
- Sognefjord
- Sohag Governorate
- Sohu
- Soil acidification
- Soil and grain
- Soil biology
- Soil chemistry
- Soil classification
- Soil fertility
- Soil formation
- Soil health
- Soil horizon
- Soil liquefaction
- Soil mechanics
- Soil morphology
- Soil pH
- Soil physics
- Soil salinity control
- Soil science
- Soil steam sterilization
- Soil texture
- Soil type
- Soil vapor extraction
- Soil
- Sojourner (rover)
- Soke (legal)
- Sokollu Mehmed Pasha
- Sokołowsko
- Sokoto Caliphate
- Sokoto State
- Sokoto
- Sol (colloid)
- Sol-Iletsk
- Solanaceae
- Solapur
- Solar activity and climate
- Solar calendar
- Solar cell
- Solar core
- Solar cycle
- Solar deity
- Solar eclipse
- Solar energy
- Solar flare
- Solar fuel
- Solar luminosity
- Solar mass
- Solar neutrino
- Solar phenomena
- Solar power
- Solar radius
- Solar rotation
- Solar storm
- Solar System
- Solar telescope
- Solar time
- Solar wind
- Solaris (1972 film)
- Solder
- Soldering
- Soldier
- Sole (fish)
- Sole proprietorship
- Solenodon
- Solenoid
- Solenoidal vector field
- Solicitation
- Solicitor
- Solid acid
- Solid angle
- Solid geometry
- Solid hydrogen
- Solid mechanics
- Solid oxygen
- Solid solution
- Solid-state chemistry
- Solid-state drive
- Solid-state laser
- Solid-state physics
- Solid
- Solidago
- Solidarity (Polish trade union)
- Solidarity
- Solifugae
- Soliloquy
- Solingen
- Solitaire
- Solo Man
- Sologne
- Sololá
- Solomon (Handel)
- Solomon Babalola
- Solomon Islands (archipelago)
- Solomon Islands
- Solomon Judah Loeb Rapoport
- Solomon R. Guggenheim Museum
- Solomon Sea
- Solomon
- Solon Borglum
- Solstice
- Solubility
- Soluntum
- Solution (chemistry)
- Solutional cave
- Solutrean
- Solvation
- Solvent
- Somali cat
- Somali Civil War (2009–present)
- Somali Civil War
- Somali language
- Somali Region
- Somalia
- Somaliland campaign
- Somaliland
- Somapura Mahavihara
- Somatic Cell and Molecular Genetics
- Somatic cell nuclear transfer
- Somatic cell
- Somatic fusion
- Somatosensory system
- Sombrero Galaxy
- Some Like It Hot
- Somerset v Stewart
- Somerset
- Somersworth, New Hampshire
- Somewhere (song)
- Sommer
- Somogy County
- Sonar
- Sonata da camera
- Sonata form
- Sonata
- Sonchus
- Sønderborg
- Sondershausen
- Song (state)
- Song dynasty
- Song of Solomon (novel)
- Song of Songs
- Song
- Songbird
- Songhai Empire
- Songhua River
- Songket
- Songkran
- Songs of Innocence and of Experience
- Sonic boom
- Sonic the Hedgehog (character)
- Sonic weapon
- Soninke-Marabout War (1850–1856)
- Sonneberg
- Sonnet 18
- Sonnet 20
- Sonnet
- Sonnets to Orpheus
- Sonora
- Sonoran Desert
- Sons and Lovers
- Sonsonate, El Salvador
- Sony
- Sophia (given name)
- Sophia Dorothea of Celle
- Sophia Lee
- Sophie d'Houdetot
- Sophie Dawes, Baronne de Feuchères
- Sophie Gay
- Sophie Ristaud Cottin
- Sophie Schröder
- Sophie Swetchine
- Sophie's World
- Sophist
- Sophus Bugge
- Sophus Schandorph
- Soprano
- Sora, Lazio
- Sorbitol
- Sordello
- Sore throat
- Sorghum bicolor
- Sorghum
- Soroca
- Sorong
- Sorrento
- Sorrow (emotion)
- Sorter (logistics)
- Sorting algorithm
- Sorting
- Sosigenes (astronomer)
- Sosigenes the Peripatetic
- Sositheus
- Sothic cycle
- Sotho language
- Sōtō
- Soul dualism
- Soul loss
- Soul music
- Soul
- Soumak
- Sound card
- Sound change
- Sound design
- Sound pressure
- Sound recording and reproduction
- Sound
- Soundtrack
- Source code
- Sources of law
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- Sousaphone
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- South Africa
- South African Border War
- South African English
- South African literature
- South African rand
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- South America
- South American dreadnought race
- South American fox
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- South Atlantic states
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- South magnetic pole
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- South Molton
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- South Orkney Islands
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- South Pole Telescope
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- South
- Southampton Island
- Southampton
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- Southeast Asia
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- Southeast Sulawesi
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- Southern Alps
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- Southern Bug
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- Southern giraffe
- Southern hawker
- Southern Hemisphere
- Southern Metropolis Daily
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- Southern Nations, Nationalities, and Peoples' Region
- Southern Ndebele language
- Southern Ocean
- Southern Poverty Law Center
- Southern right whale
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- Southern Weekly
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- Sovereign state
- Sovereignty
- Sovetsk, Kaliningrad Oblast
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- Soviet famine of 1930–1933
- Soviet famine of 1946–1947
- Soviet invasion of Manchuria
- Soviet partisans
- Soviet space program
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- Sowar
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- Soybean
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- Soyuz programme
- Sozomen
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- Space Battleship Yamato
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- Space complexity
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- Space hierarchy theorem
- Space Needle
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- Space Shuttle Columbia disaster
- Space Shuttle
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- Space
- Spacecraft electric propulsion
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- Spacetime diagram
- Spacetime
- SpaceX
- Spade
- Spain
- Spalacotherium
- Spalax
- Spallation
- Spamming
- Span (unit)
- Spandrel
- Spanish Adoptionism
- Spanish American wars of independence
- Spanish architecture
- Spanish Armada
- Spanish Civil War
- Spanish colonization of the Americas
- Spanish conquest of the Aztec Empire
- Spanish conquest of the Inca Empire
- Spanish conquest of the Maya
- Spanish dancer
- Spanish East Indies
- Spanish Empire
- Spanish Fighting Bull
- Spanish flu
- Spanish garden
- Spanish Gothic architecture
- Spanish Inquisition
- Spanish language
- Spanish literature
- Spanish mackerel
- Spanish moss
- Spanish Netherlands
- Spanish Renaissance architecture
- Spanish Town
- Spanish Virgin Islands
- Spanish–American War
- Sparassodonta
- Sparidae
- Sparta
- Speak, Memory
- Speaking in tongues
- Spear-thrower
- Spear
- Spearmint
- SPECfp
- Special drawing rights
- Special effect
- Special forces
- Special Region of Yogyakarta
- Special relativity
- Speciation
- Species
- Specific performance
- Spectacled bear
- Spectral density
- Spectral energy distribution
- Spectral graph theory
- Spectral index
- Spectral line shape
- Spectral line
- Spectrometer
- Spectroscopy
- Spectrum Range
- Speculative fiction
- Speech act
- Speech disorder
- Speech processing
- Speech recognition
- Speech repetition
- Speech synthesis
- Speech–language pathology
- Speech
- Speed of light
- Speed of sound
- Speed Racer
- Speed
- Speedometer
- Speeton Clay Formation
- Speleothem
- Spelling pronunciation
- Spelling reform
- Spelling
- Spelt
- Spem in alium
- Spencer Compton, 2nd Earl of Northampton
- Spencer Fullerton Baird
- Spencer Walpole
- Sperm whale
- Sperm
- Spermaceti
- Spermatogenesis
- Spermatophyte
- Spermophilus
- Sphaeristerium
- Sphagnum
- Sphalerite
- Sphenophyllales
- Sphenophyllum
- Sphere of influence
- Sphere
- Spherical astronomy
- Spherical coordinate system
- Spherical Earth
- Spherical geometry
- Spherical harmonics
- Spherometer
- Spherulite
- Sphingidae
- Sphinx
- Sphynx cat
- Spica
- Spice trade
- SPICE
- Spice
- Spider monkey
- Spider-Man
- Spider
- Spiegel affair
- Spin (physics)
- Spīn Ghar
- Spin quantum number
- Spin–orbit interaction
- Spinach
- Spinal cord injury
- Spinal cord
- Spindle (textiles)
- Spinel
- Spinello Aretino
- Spinneret (polymers)
- Spinning (polymers)
- Spinning frame
- Spinning jenny
- Spinning mule
- Spinning wheel
- Spinosauridae
- Spinosaurus
- Spiny lobster
- Spiral (TV series)
- Spiral galaxy
- Spiral separator
- Spire light
- Spirit (rover)
- Spirit (vital essence)
- Spirit level
- Spirit of St. Louis
- Spirit of the Dead Watching
- Spirit possession
- Spirited Away
- Spiritual gift
- Spiritual practice
- Spiritualism
- Spirituality
- Spirituals
- Spirkin Oseredok Island
- Spirogyra
- Spirotrich
- Spirou & Fantasio
- Spirula
- Spiti
- Spitsbergen
- Spitz
- Spitzer Space Telescope
- Spleen
- Splinter
- Splügen Pass
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- Spokane, Washington
- Spoken language
- Spoken word
- Sponge grenade
- Sponge
- SpongeBob SquarePants (character)
- SpongeBob SquarePants
- Spongia officinalis
- Spontaneous emission
- Spontaneous magnetization
- Spontaneous symmetry breaking
- Spoonbill
- Sporades
- Sporangium
- Spore
- Sporophyte
- Sport bike
- Sport of athletics
- Sport utility vehicle
- Sport
- Sports car
- Sports commentator
- Sports Illustrated Swimsuit Issue
- Sports Illustrated
- Sports journalism
- Sports medicine
- Sports novel
- Sports radio
- Spotify
- Spotted dove
- Spotted ratfish
- Spotted skunk
- Sprain
- Sprat
- Spratly Islands
- Spray drying
- Spreadsheet
- Spree killer
- Spremberg
- Spring (device)
- Spring (hydrology)
- Spring (season)
- Spring and Autumn Annals
- Spring and Autumn period
- Spring break
- Spring steel
- Spring-gun
- Springbok
- Springfield, Illinois
- Springtail
- Sprite (folklore)
- Sprite (lightning)
- Spruce
- Spur (architecture)
- Spur
- Spurius Maelius
- Sputnik 1
- Sputnik 2
- Spyridon Trikoupis
- Spyware
- SQL
- Squalene
- Squamata
- Square (algebra)
- Square dance
- Square degree
- Square Enix Image Studio Division
- Square foot
- Square inch
- Square Kilometre Array
- Square kilometre
- Square metre
- Square mile
- Square root of 2
- Square root
- Square yard
- Square
- Squaring the circle
- Squat lobster
- Squat toilet
- Squaw
- Squeeze theorem
- Squid
- Squilla mantis
- Squinch
- Squirrel monkey
- Squirrel
- Śramaṇa
- Srebrenica massacre
- Sretensk
- SRGB
- Sri Jayawardenepura Kotte
- Sri Lanka
- Sri Lankan Civil War
- Srikakulam
- Srinagar
- Srivijaya
- SSPSF model
- St John Brodrick, 1st Earl of Midleton
- St Kilda, Scotland
- St Mark's Basilica
- St Mary's Loch
- St Matthew Passion
- St Michael's Mount
- St. Augustine, Florida
- St. Bernard (dog)
- St. Catharines
- St. Elmo's fire
- St. Elsewhere
- St. George Jackson Mivart
- St. George's, Grenada
- St. John's, Antigua and Barbuda
- St. John's, Newfoundland and Labrador
- St. Johns River
- St. Lawrence River
- St. Lawrence Seaway
- St. Louis
- St. Patrick's Cathedral (Midtown Manhattan)
- St. Peter's Basilica
- ST506/ST412
- Stab wound
- Stab-in-the-back myth
- Stabat Mater (Pergolesi)
- Stabiae
- Stability theory
- Stabilizer (aeronautics)
- Stable marriage problem
- Stable roommates problem
- Stable theory
- Stable
- Stack (abstract data type)
- Stack interchange
- Städel
- Stadia mark
- Stadimeter
- Stadion (unit)
- Staff (military)
- Staff (music)
- Stafford Northcote, 1st Earl of Iddesleigh
- Staffordshire Bull Terrier
- Staffordshire figure
- Staffordshire Potteries
- Staffordshire
- Stag beetle
- Stage (stratigraphy)
- Stage (theatre)
- Stage hypnosis
- Stage lighting
- Stage management
- Stagecoach (1939 film)
- Stagecoach Group
- Stagecoach
- Stagecraft
- Staggered conformation
- Staging (theatre, film, television)
- Stained glass
- Stainless steel
- Stairs
- Stairway to Heaven
- Stalactite
- Stalagmite
- Stalking
- Stamen
- Stamp mill
- Stanchion
- Stand by Your Man
- Stand-up comedy
- Standard atmosphere (unit)
- Standard atomic weight
- Standard cell
- Standard deviation
- Standard electrode potential
- Standard error
- Standard French
- Standard gravity
- Standard hydrogen electrode
- Standard language
- Standard Model
- Standard Oil
- Standardization
- Standardized test
- Standards Department
- Standerton
- Standing (law)
- Standing Committee of the National People's Congress
- Standing wave
- Stanford University
- Stanislao Cannizzaro
- Stanislas de Boufflers
- Stanislas Julien
- Stanislaus Hosius
- Stanisław August Poniatowski
- Stanisław Koniecpolski
- Stanisław Leszczyński
- Stanisław Małachowski
- Stanisław Szczęsny Potocki
- Stanisław Żółkiewski
- Stanley Leathes
- Stannary
- Stannite
- Stanser Verkommnis
- Staphylococcal infection
- Staphylococcus aureus
- Stapleton Cotton, 1st Viscount Combermere
- Star and crescent
- Star Awards
- Star chart
- Star cluster
- Star formation
- Star of David
- Star system
- Star Trek: The Next Generation
- Star Trek: The Original Series
- Star Trek
- Star Wars (film)
- Star Wars
- Star-nosed mole
- Star
- Staraya Russa
- Starbuck Island
- Starbucks
- Starburst galaxy
- Starburst region
- Starch
- Starfish
- Stargard
- Stari Most
- Stark effect
- Starling
- Starokadomsky Island
- Startup company
- Stasinus
- Staßfurt
- Statcoulomb
- State (computer science)
- State (polity)
- State Grid Corporation of China
- State Historical Museum
- State of emergency
- State of matter
- State of Mexico
- State of Palestine
- State Opening of Parliament
- State religion
- State school
- State trials
- State University of New York
- State-owned enterprise
- Statelessness
- Statement of changes in equity
- Staten Island
- States and federal territories of Malaysia
- States and regions of Somalia
- States and territories of Australia
- States of Austria
- States of Germany
- States of Nigeria
- States of Venezuela
- States' rights
- Static electricity
- Static random-access memory
- Statics
- Station wagon
- Stationary point
- Stationary state
- Stationary-action principle
- Statistical hypothesis testing
- Statistical mechanics
- Statistical physics
- Statistical population
- Statistical significance
- Statistics
- Statius
- Stato da Màr
- Statue of Abraham Lincoln (Lincoln Memorial)
- Statue of Freedom
- Statue of George Washington (Houdon)
- Statue of Liberty
- Statue of Peace
- Statue of Zeus at Olympia
- Statue
- Statute merchant
- Statute of limitations
- Statute of Westminster 1931
- Statute
- Statutes of Kilkenny
- Statutory interpretation
- Statutory law
- Statutory rape
- Staubbach Falls
- Staurakios
- Staurolite
- Stavanger
- Stavropol
- Steady state
- Steady-state model
- Stealth technology
- Steam (service)
- Steam devil
- Steam distillation
- Steam engine
- Steam locomotive
- Steam turbine
- Steam
- Steamboat Geyser
- Steamboat Willie
- Steamboat
- Steampunk
- Steamroller
- Steamship
- Stearyl alcohol
- Stecknitz Canal
- Steel and tin cans
- Steel building
- Steel
- Steelmaking
- Steenkerque
- Stefan Czarniecki
- Stefan Yavorsky
- Stefan–Boltzmann law
- Stefano della Bella
- Stefano Evodio Assemani
- Stefano Jacini
- Steffi Graf
- Steganography
- Stegoceras
- Stegosauria
- Stegosaurus
- Stele (biology)
- Stellar association
- Stellar atmosphere
- Stellar black hole
- Stellar classification
- Stellar core
- Stellar corona
- Stellar evolution
- Stellar kinematics
- Stellar magnetic field
- Stellar mass
- Stellar nucleosynthesis
- Stellar parallax
- Stellar rotation
- Stellar structure
- Stellar wind
- Stellenbosch University
- Steller's sea cow
- Stem cell
- Stem-cell therapy
- Stendhal
- Stenka Razin
- Stenopodidea
- Stenothermic
- Step cutting
- Step dance
- Step function
- Step-growth polymerization
- Stephan Bergler
- Stéphanie Félicité, comtesse de Genlis
- Stephanie
- Stephanite
- Stephanus of Byzantium
- Stephen Bar Sudhaile
- Stephen Báthory
- Stephen Bocskai
- Stephen Borough
- Stephen D. Lee
- Stephen Fox
- Stephen Gosson
- Stephen of Ripon
- Stephen Phillips
- Stephen Storace
- Stephen V of Hungary
- Stephen Van Rensselaer
- Stephenson 2-18
- Steppe bison
- Steppe eagle
- Steppe
- Steppenwolf (novel)
- Stepwise reaction
- Steradian
- Stere
- Stereocenter
- Stereoisomerism
- Stereospondyli
- Stereotype
- Steric effects
- Sterilization (medicine)
- Sterilization (microbiology)
- Stern–Gerlach experiment
- Sternum
- Steroid hormone
- Steroid
- Stethacanthus
- Steven Universe
- Stevenston
- Stewardship (theology)
- Stewarton
- Sthenurus
- Stibarsen
- Stibine
- Stichometry
- Stick mantis
- Stické
- Stickleback
- Stiffness
- Stigand
- Stilbite
- Still life
- Stillbirth
- Stillicidium
- Stilpo
- Stilt
- Stimulant
- Stimulated emission
- Stingless bee
- Stingray
- Štip
- Stipend
- Stirling cycle
- Stirling engine
- Stirling number
- Stirling numbers of the first kind
- Stirling numbers of the second kind
- Stirling's approximation
- Stirrup
- Stoat
- Stobaeus
- Stochastic process
- Stock character
- Stock exchange
- Stock market index
- Stock market
- Stock
- Stockholm Archipelago
- Stockholm Bloodbath
- Stockholm metro
- Stockholm
- Stocking
- Stockton, California
- Stoichiometry
- Stoicism
- Stoke-on-Trent
- Stokes drift
- Stokes parameters
- Stokes' theorem
- Stolbovoy Island
- Stoma
- Stomach cancer
- Stomach
- Stomatosuchidae
- Stomiiformes
- Stone (unit)
- Stone Age
- Stone carving
- Stone Forest
- Stone Mountain
- Stone pine
- Stone slab
- Stone-curlew
- Stonehenge
- Stonemasonry
- Stonewall Jackson
- Stonewall riots
- Stoneware
- Stoney units
- Stoolball
- Stop motion
- Stopford Brooke (chaplain)
- Stopwatch
- Stora Sjöfallet National Park
- Stored-program computer
- Stork
- Storm surge
- Storm
- Storming of the Bastille
- Story arc
- Story of Ahikar
- Story of Sinuhe
- Storytelling
- Stove
- Straight edge
- Straight Outta Compton
- Straight razor
- Strain (chemistry)
- Strain (injury)
- Strait of Dover
- Strait of Georgia
- Strait of Gibraltar
- Strait of Hormuz
- Strait of Juan de Fuca
- Strait of Magellan
- Strait of Malacca
- Strait of Otranto
- Straits of Florida
- Straits Settlements
- Strange Case of Dr Jekyll and Mr Hyde
- Strange Fruit
- Strange quark
- Strangeness
- Stranger Things
- Strasbourg
- Strasserism
- Strata Florida Abbey
- Strategic bomber
- Strategic bombing during World War II
- Strategic bombing
- Strategic dominance
- Strategos
- Strategy (game theory)
- Stratford Canning, 1st Viscount Stratford de Redcliffe
- Strathpeffer
- Stratigraphic section
- Stratigraphic unit
- Stratigraphy
- Stratocumulus cloud
- Stratosphere
- Stratovolcano
- Stratum
- Stratus cloud
- Straubing
- Straw plaiting
- Straw
- Strawberry Fields Forever
- Strawberry
- Stream bed
- Stream of consciousness
- Stream
- Streamflow
- Streaming media
- Streaming television
- Streamline Moderne
- Street art
- Street dance
- Street performance
- Street photography
- Strelitzia
- Strength of materials
- Strepsiptera
- Strepsirrhini
- Streptocarpus
- Streptococcal pharyngitis
- Streptococcus
- Stress (biology)
- Stress (mechanics)
- Stress–energy tensor
- Stretch sensor
- Strigolactone
- Strike action
- Strike and dip
- Strike fighter
- String (computer science)
- String (physics)
- String instrument
- String Quartet No. 14 (Beethoven)
- String Quartets, Op. 76 (Haydn)
- String Quintet (Schubert)
- String Quintet in E major, Op. 11, No. 5 (Boccherini)
- String theory
- String-searching algorithm
- Stringer Lawrence
- Striped polecat
- Stripping (chemistry)
- Striptease
- Strix (bird)
- Stroke
- Strokkur
- Stromatolite
- Stromboli
- Strong cryptography
- Strong gravitational lensing
- Strong interaction
- Strongylion
- Strongylocentrotus purpuratus
- Strontium
- Strophanthus
- Strophe
- Strophoid
- Strozzi
- Structural analysis
- Structural basin
- Structural biology
- Structural chemistry
- Structural coloration
- Structural engineering
- Structural formula
- Structural functionalism
- Structural geology
- Structural isomer
- Structuralism
- Structure (mathematical logic)
- Structure and agency
- Structure formation
- Structured analysis
- Structured cabling
- Structured programming
- Strychnine
- Strzegom
- Stuart period
- Stuart Restoration
- Student activism
- Student's t-distribution
- Student's t-test
- Studio system
- Study (room)
- Stun grenade
- Stun gun
- Stunt
- Stupendemys
- Sturdza family
- Sturgeon
- Sturtian glaciation
- Stuttering
- Stuttgart
- Style (visual arts)
- Style guide
- Stylistics
- Stylobate
- Stylophora
- Styracosaurus
- Styrax
- Styrene
- Styria
- Sub-brown dwarf
- Sub-orbital spaceflight
- Sub-Saharan Africa
- Sub-Saharan African music traditions
- Subantarctic
- Subarctic climate
- Subarctic
- Subaru Telescope
- Subatomic particle
- Subcarpathian Voivodeship
- Subcategory
- Subconscious
- Subculture
- Subdivisions of Gabon
- Subduction
- Subdwarf
- Subfossil lemur
- Subgiant
- Subinfeudation
- Sublimation (phase transition)
- Sublime (philosophy)
- Sublime Porte
- Submachine gun
- Submarine communications cable
- Submarine
- Submersible
- Submillimetre astronomy
- Subnetwork
- Subotica
- Subpoena
- Subroutine
- Subset
- Subsidence
- Subsidy
- Subsistence agriculture
- Subspecies
- Substance abuse
- Substance dependence
- Substance use disorder
- Substantive dye
- Substantive law
- Substellar object
- Substituent
- Substitution (law)
- Substitution reaction
- Substrate (chemistry)
- Subtraction
- Subtractor
- Subtropics
- Suburb
- Subway (restaurant)
- Successive over-relaxation
- Succubus
- Suceava
- Sucre
- Sucrose
- Suction filtration
- Suctoria
- Suda
- Sudan (region)
- Sudan
- Sudanese Revolution
- Sudatorium
- Sudbury Basin
- Sudd
- Süddeutsche Zeitung
- Suebi
- Suede
- Suessula
- Suez Canal
- Suez Crisis
- Suez Governorate
- Suffering
- Suffolk
- Suffragan bishop
- Suffrage
- Sufi whirling
- Sufism
- Sugar alcohol
- Sugar beet
- Sugar glider
- Sugar
- Sugarcane
- Sugarplum
- Suggestion
- Suhrawardiyya
- Sui dynasty
- Suicide (Durkheim book)
- Suicide crisis
- Suicide methods
- Suicide
- Suite (music)
- Suite bergamasque
- Sukabumi
- Sukhothai Kingdom
- Sukhumi
- Sukiyaki (song)
- Sukkot
- Sukkur
- Sula Islands Regency
- Sulaiman Mountains
- Sulawesi
- Sulaymaniyah
- Suleiman the Magnificent
- Süleymanlı
- Sulfate mineral
- Sulfate
- Sulfide mineral
- Sulfide
- Sulfite
- Sulfolobus
- Sulfonic acid
- Sulfonmethane
- Sulfur dioxide
- Sulfur hexafluoride circuit breaker
- Sulfur hexafluoride
- Sulfur trioxide
- Sulfur
- Sulfuric acid
- Sulidae
- Sully Prudhomme
- Sulmona
- Sulpicia
- Sulpicius Apollinaris
- Sultan
- Sultanabad ware
- Sultanate of Agadez
- Sultanate of Gowa
- Sultanate of Hobyo
- Sultanate of Mogadishu
- Sultanate of Rum
- Sultanate of Ternate
- Sultanpur district
- Sulu Archipelago
- Sulu Sea
- Sum of Logic
- Sumac
- Sumatra
- Sumatran orangutan
- Sumatran rhinoceros
- Sumatran tiger
- Sumba
- Sumbawa
- Sumer
- Sumerian King List
- Sumerian language
- Summa Theologica
- Summary judgment
- Summary jurisdiction
- Summary offence
- Summation
- Summer solstice
- Summer stock theater
- Summer Triangle
- Summer
- Summerhill School
- Summit (meeting)
- Summit
- Sumptuary law
- Sumy Oblast
- Sumy
- Sun bear
- Sun dog
- Sun-synchronous orbit
- Sun
- Sunbeam
- Sunbird
- Sunbittern
- Sunburn
- Suncheon
- Sunda clouded leopard
- Sunda Islands
- Sunda Kingdom
- Sunda Strait
- Sundanese language
- Sundarbans National Park
- Sundarbans
- Sunday magazine
- Sunday Silence
- Sunday
- Sunderland
- Sundial
- Sunflower sea star
- Sunflowers (Van Gogh series)
- Sungai Ruan
- Sungrazing comet
- Sunlight
- Sunnah
- Sunni Islam
- Sunrise (Australian TV program)
- Sunrise: A Song of Two Humans
- Sunrise
- Sunroom
- Sunset Boulevard (film)
- Sunset
- Sunshine Coast, Queensland
- Sunshine Policy
- Sunspot
- Sunstone
- Sunyani
- Śūnyatā
- Sup'ung Dam
- Super Commando Dhruva
- Super grid
- Super Mario Bros. theme
- Super star cluster
- Super-Earth
- Superacid
- Superbase
- Superbubble
- Supercapacitor
- Supercar
- Supercargo
- Supercell
- Supercentenarian
- Supercluster
- Supercomputer
- Superconductivity
- Supercontinent
- Supercritical fluid
- Supererogation
- Superficies
- Superfluid helium-4
- Superfluidity
- Supergiant
- Supergravity
- Superheavy element
- Superhero fiction
- Superhero
- Superheterodyne receiver
- Superluminous supernova
- Superman (1978 film)
- Superman
- Supermarket
- Supermassive black hole
- Superminicomputer
- Supermoon
- Supernatural (American TV series)
- Supernatural
- Supernova nucleosynthesis
- Supernova
- Superoxide
- Superposed order
- Superposition principle
- Supersolid
- Superstition
- Superstring theory
- Supersymmetry
- Supervillain
- Supervolcano
- Supply and demand
- Supply chain management
- Supply chain
- Support group
- Supporting character
- Supramolecular chemistry
- Suprematism
- Supreme Commander for the Allied Powers
- Supreme Court of Canada
- Supreme Court of India
- Supreme Court of the United Kingdom
- Supreme Court of the United States
- Surabaya
- Surah
- Surakarta
- Surat
- Surcoat
- Surety
- Surf music
- Surface (mathematics)
- Surface area
- Surface brightness
- Surface integral
- Surface mining
- Surface science
- Surface tension
- Surface weather analysis
- Surface weather observation
- Surface-to-air missile
- Surge protector
- Surgeon
- Surgery
- Surgical airway management
- Surgical instrument
- Surguja district
- Surigao Strait
- Suriname
- Surjective function
- Surname
- Surprise (emotion)
- Surrealism
- Surrender of Japan
- Surrey (carriage)
- Surrey
- Surtsey
- Suruga Bay
- Surveillance aircraft
- Survey methodology
- Surveying
- Surveyor's wheel
- Survival skills
- Survivor (American TV series)
- Surya
- Sus (genus)
- Susa, Piedmont
- Susa
- Susan B. Anthony
- Susan Edmonstone Ferrier
- Susan G. Komen for the Cure
- Susan Rice
- Susanna Centlivre
- Susanoo-no-Mikoto
- Susarion
- Suspended load
- Suspension (chemistry)
- Suspension bridge
- Suspensura
- Susquehanna River
- Sussex
- Sustainability
- Sustainable agriculture
- Sustainable architecture
- Sustainable development
- Sustainable energy
- Sustainable products
- Sutemi Horiguchi
- Sutherland Falls
- Sutlej
- Sutler
- Sutta Piṭaka
- Suva
- Suwon
- Suzanne Desprès
- Suzhou dialect
- Suzhou
- Svabhava
- Svabite
- Svalbard
- Svane
- Svaneti
- Svante Arrhenius
- Svasaṃvedana
- Svealand
- Sven Holm
- Śvētāmbara
- Svishtov
- Swabian League
- SWAC (computer)
- Swahili coast
- Swahili language
- Swallow
- Swallowtail butterfly
- Swamp
- Swamphen
- Swan goose
- Swan Lake
- Swan
- Swansea
- Swap (finance)
- Swarthmore College
- Swastika
- Swather
- Swazi language
- Sweating sickness
- Sweatshop
- Sweden during the late 19th century
- Sweden
- Swedish colonies in the Americas
- Swedish Empire
- Swedish language
- Swedish literature
- Swedish overseas colonies
- Sweeney Todd
- Sweet corn
- Sweet potato
- Sweetness
- Swellendam
- Świebodzin
- Świecie
- Świętokrzyskie Voivodeship
- Swift (bird)
- Swift (programming language)
- Swiftlet
- Swimming
- Swing (dance)
- Swing Low, Sweet Chariot
- Swing music
- Świnoujście
- Swiss Army knife
- Swiss franc
- Swiss German
- Swiss literature
- Swiss neutrality
- Switch statement
- Switch
- Switchblade
- Switching circuit theory
- Swithun
- Switzerland
- Sword Art Online
- Sword swallowing
- Sword
- Swordfish
- Swynford
- Syagrus romanzoffiana
- Sybaris
- Sycon
- Sydney Harbour Bridge
- Sydney Metro
- Sydney Opera House
- Sydney Smith
- Sydney Thompson Dobell
- Sydney, Lady Morgan
- Sydney
- Syed Ahmad Khan
- Syktyvkar
- Sylhet Division
- Sylhet
- Syllabary
- Syllable
- Syllabus
- Syllogism
- Sylvestrines
- Sylvite
- Symbian
- Symbiogenesis
- Symbiosis
- Symbol
- Symbolic interactionism
- Symbolism (arts)
- Symeon of Durham
- Symeon the Metaphrast
- Symmetric relation
- Symmetric-key algorithm
- Symmetry (geometry)
- Symmetry (physics)
- Symmetry breaking
- Symmetry in biology
- Symmetry in mathematics
- Symmetry in quantum mechanics
- Symmetry
- Symmorphosis
- Sympathetic nervous system
- Sympathy for the Devil
- Symphonic poem
- Symphonie fantastique
- Symphony Hall, Boston
- Symphony in White, No. 1: The White Girl
- Symphony No. 2 (Mahler)
- Symphony No. 2 (Rachmaninoff)
- Symphony No. 2 (Sibelius)
- Symphony No. 3 (Beethoven)
- Symphony No. 3 (Górecki)
- Symphony No. 3 (Saint-Saëns)
- Symphony No. 4 (Brahms)
- Symphony No. 5 (Beethoven)
- Symphony No. 5 (Mahler)
- Symphony No. 5 (Shostakovich)
- Symphony No. 5 (Sibelius)
- Symphony No. 5 (Tchaikovsky)
- Symphony No. 6 (Beethoven)
- Symphony No. 6 (Tchaikovsky)
- Symphony No. 7 (Beethoven)
- Symphony No. 7 (Shostakovich)
- Symphony No. 7 (Sibelius)
- Symphony No. 8 (Mahler)
- Symphony No. 8 (Schubert)
- Symphony No. 9 (Beethoven)
- Symphony No. 9 (Bruckner)
- Symphony No. 9 (Dvořák)
- Symphony No. 9 (Schubert)
- Symphony No. 40 (Mozart)
- Symphony No. 41 (Mozart)
- Symphony
- Symphosius
- Symphyla
- Symposium (Plato)
- Symposium
- Symptomatic treatment
- Synagogue of the Libertines
- Synagogue
- Synapse
- Synapsid
- Synaxarium
- Synchronous circuit
- Synchronous grid of Continental Europe
- Synchronverter
- Synchrotron radiation
- Syncline
- Syncope (medicine)
- Syncretism
- Syndic
- Syndicalism
- Syndie
- Syndrome
- Synechism
- Synedrion
- Synesius
- Synesthesia
- Syngas
- Syngnathiformes
- Synod of Ancyra
- Synod of Arles
- Synod of Elvira
- Synod of Neocaesarea
- Synod of Pistoia
- Synod
- Synodontidae
- Synods of Antioch
- Synods of Westminster
- Syntactic ambiguity
- Syntactic change
- Syntax (programming languages)
- Syntax
- Synth-pop
- Synthesizer
- Synthetic biology
- Synthetic biopolymer
- Synthetic element
- Synthetic fiber
- Synthetoceras
- Syntipas
- Syphilis
- SyQuest EZ 135 Drive
- Syr Darya
- Syracuse University
- Syracuse, New York
- Syracuse, Sicily
- Syria–Lebanon campaign
- Syria
- Syriac language
- Syriac literature
- Syrian civil war
- Syrian Wars
- Syrianus
- Syro-Malabar Church
- Syro-Malankara Catholic Church
- Syros
- System (stratigraphy)
- System call
- System Management Mode
- System of differential equations
- System of linear equations
- System of measurement
- System on a chip
- System software
- System time
- System
- Systematic element name
- Systematics
- Systemic functional linguistics
- Systems biology
- Systems design
- Systems engineering
- Systolic geometry
- Szabolcs-Szatmár-Bereg County
- Szczawno-Zdrój
- Szczecin
- Szczecinek
- Szeged
- Székely Land
- Székelys
- Szklarska Poręba
- T cell
- T Tauri star
- T-square
- T-top
- T. Alexander Harrison
- T. H. Green
- T. Madhava Rao
- T. Muthuswamy Iyer
- T. W. Robertson
- Ta Khmau municipality
- Ta Kung Pao
- Ta'anit
- Taal Volcano
- Tab (interface)
- Tabasco pepper
- Tabasco
- Tabby cat
- Table (furniture)
- Table tennis
- Table View
- Table-turning
- Tablespoon
- Tablet (pharmacy)
- Tablet computer
- Tablinum
- Tabloid journalism
- Taboo
- Tabqa Dam
- Tabriz
- Tabuk Province
- Tabuk, Saudi Arabia
- Taceddin Ahmedi
- Tacheometry
- Tachinidae
- Tachylite
- Tachyon
- Tacitus (emperor)
- Tacloban
- Tacna
- Tacoma Narrows Bridge
- Tacoma, Washington
- Tactical formation
- Taddeo Zuccari
- Tadeusz Brzozowski
- Tadeusz Kościuszko
- Tadorna
- Tadpole
- Taebaek Mountains
- Taego Bou
- Taenia solium
- Taeniasis
- Taeniodonta
- Tafilalt
- Tafraout
- Tafsir
- Tagalog language
- Taganrog
- Tagesschau (German TV programme)
- Tagetes
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- Taguig
- Tagus
- Tahiti
- Tahitian language
- Tahpanhes
- Tahr
- Taichung
- Taif
- Taifa
- Taiga drama
- Taiga
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- Tailed frog
- Táin Bó Cúailnge
- Tainan
- Taipa
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- Taipei 101
- Taipei Metro
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- Taiping Rebellion
- Tait's conjecture
- Taitung County
- Taiwan High Speed Rail
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- Taiwan under Qing rule
- Taiwan
- Taiwanese Hokkien
- Taiwanese indigenous peoples
- Taiyō ni Hoero!
- Taiyuan
- Taiz
- Taj Mahal
- Tajik language
- Tajikistan
- Tajwid
- Takahē
- Takamatsu
- Takasaki
- Takayasu's arteritis
- Take Five
- Take the "A" Train
- Takeshi's Castle
- Takhtsinhji
- Takifugu
- Takin
- Taklamakan Desert
- Tala (music)
- Talal
- Talar
- Talbot Hamlin
- Talc
- Talca
- Tale of Aqhat
- Tales from the Crypt (TV series)
- Tales of Count Lucanor
- Talianki (archaeological site)
- Taliban
- Talk radio
- Talk show
- Tall tale
- Tallage
- Tallahassee, Florida
- Tallinn
- Tallit
- Tally marks
- Talmud
- Taloqan
- Taluqdar
- Talwar
- Tam Dalyell of the Binns
- Tam Kỳ
- Tamandua
- Tamarin
- Tamarind
- Tamás Bakócz
- Tamás Nádasdy
- Tamaulipas
- Tambaqui
- Tambour
- Tambralinga
- Tamburello
- Tamiahua Lagoon
- Tamil language
- Tamil Nadu
- Tamisiocarididae
- Tamluk
- Tammany Hall
- Tampa, Florida
- Tampere
- Tampico
- Tampon
- Tan (color)
- Tanabata
- Tanacetum balsamita
- Tanager
- Tanana River
- Tancred, King of Sicily
- Tancred, Prince of Galilee
- Tandem bicycle
- Tanegashima
- Tang dynasty art
- Tang dynasty
- Tang-e Gharu
- Tangail
- Tangerang
- Tangerine
- Tangermünde
- Tangier
- Tanglewood
- Tango music
- Tango
- Tangshan
- Tangye
- Tanimbar Islands
- Tanistry
- Tank (city)
- Tank
- Tanker (ship)
- Tannaim
- Tannhäuser (opera)
- Tannic acid
- Tannin
- Tanning (leather)
- Tanning lamp
- Tanougou Falls
- Tanta
- Tantalum
- Tantra
- Tanystropheus
- Tanzania
- Tanzanite
- Tao Te Ching
- Tao
- Taobao
- Taoism
- Taoist diet
- Taoist philosophy
- Taos Pueblo
- Taoyuan, Taiwan
- Tap dance
- Tapanuli orangutan
- Tape head
- Tape measure
- Tapejaridae
- Tapestry (Carole King album)
- Tapestry
- Tapinoma melanocephalum
- Tapinoma sessile
- Tapir
- Tapp Tarock
- Tappa Hisar
- Tappet
- Taproot
- Tapti River
- Taqlid
- Tar
- Tara (Buddhism)
- Taraba State
- Tarafa
- Tarakan
- Taranaki
- Taranto
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- Tarantula Nebula
- Tarantula
- Tarapacá Region
- Tarare
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- Taraz
- Tarbela Dam
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- Tarbert
- Tardigrade
- Target Corporation
- Târgu Mureș
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- Targum
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- Tarim Basin
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- Tariqa
- Tarkani
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- Taro
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- Tarpon
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- Tarsier
- Tarski's axioms
- Tarsus (skeleton)
- Tartaric acid
- Tartu
- Tartuffe
- Tartus
- Tarumanagara
- Tarzan
- Tas-de-charge
- Taser
- Tashkent Declaration
- Tashkent
- Tasikmalaya
- Task (computing)
- Tasman District
- Tasman Glacier
- Tasman Peninsula
- Tasman Sea
- Tasmania
- Tasmanian devil
- Tasmanian Wilderness World Heritage Area
- Tassili n'Ajjer
- Tassoni
- Taste
- Tatar language
- Tatars
- Tatarstan
- Tate Modern
- Tate Wilkinson
- Tate–LaBianca murders
- Tathātā
- Tatort
- Tatta
- Tattersalls
- Tattoo
- Tattvartha Sutra
- Tatya Tope
- Tau (particle)
- Tau Ceti
- Tau neutrino
- Tauchnitz publishers
- Taulantii
- Taung Child
- Taunggyi
- Taungoo
- Taurine
- Taurini
- Taurobolium
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- Taurus Mountains
- Tautavel Man
- Tautomer
- Tavistock
- Távora affair
- Tawhid
- Tawi-Tawi Island
- Tax haven
- Tax noncompliance
- Tax
- Taxi (TV series)
- Taxi Driver
- Taxi
- Taxidermy
- Taxonomy (biology)
- Taxus baccata
- Taxus
- Tayabas Isthmus
- Tayabas
- Taylor series
- Taylor's theorem
- Taymyr Peninsula
- Tayport
- Tayug
- Tbilisi
- Tcl
- Te Wahipounamu
- Tea caddy
- Tea Party movement
- Tea Party protests
- Tea
- Teacher
- Teak
- Teal
- Teano
- Teanum Apulum
- Teapoy
- Tear gas
- Teaspoon
- Teatro di San Carlo
- Tébessa
- Tebibit
- Technetium-99m
- Technetium
- Technical (vehicle)
- Technical communication
- Technical drawing
- Technical University of Berlin
- Technical University of Braunschweig
- Technical University of Munich
- Technicolor
- Technik Museum Sinsheim
- Technion – Israel Institute of Technology
- Technische Universität Darmstadt
- Techno
- Technocracy
- Technological determinism
- Technological singularity
- Technology adoption life cycle
- Technology and society
- Technology assessment
- Technology life cycle
- Technology transfer
- Technology
- Technophilia
- Tectonic uplift
- Tectonite
- Ted Stevens Anchorage International Airport
- Teesta River
- Teetotum
- Teff
- TEFI
- Tefillin
- Tefnut
- Tegal
- Tegenaria domestica
- Teggiano
- Tegucigalpa
- Tehran Metro
- Tehran province
- Tehran
- Tehuantepec
- Teide
- Teiidae
- Teikei
- Tel Abib
- Tel Arad
- Tel Aviv District
- Tel Aviv
- Tel Yokneam
- Telangana
- Telavi
- Telecommunications engineering
- Telecommunications
- Telediario
- Telegramgate
- Telegraph Island
- Telegraphy
- Telemachus
- Telemetry
- Telenovela
- Teleoceras
- Teleological argument
- Teleosauridae
- Teleost
- Telephone exchange
- Telephone number (mathematics)
- Telephone tapping
- Telephone
- Telephony
- Teleportation
- Telescope mount
- Telescope
- Telescopium
- Telese Terme
- Telesilla
- Teletubbies
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- Television broadcasting
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- Television film
- Television in Argentina
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- Television in Brazil
- Television in Canada
- Television in China
- Television in France
- Television in Germany
- Television in Hong Kong
- Television in India
- Television in Iran
- Television in Israel
- Television in Japan
- Television in Mexico
- Television in Pakistan
- Television in Poland
- Television in Russia
- Television in South Africa
- Television in South Korea
- Television in Spain
- Television in Thailand
- Television in the Philippines
- Television in the United Kingdom
- Television in the United States
- Television in Turkey
- Television pilot
- Television presenter
- Television show
- Television station
- Television studies
- Television studio
- Television
- Tellurium
- Telogen effluvium
- Telstra
- Telugu language
- Tem language
- Temenos
- Temnodontosaurus
- Temnospondyli
- Temperament
- Temperate broadleaf and mixed forests
- Temperate climate
- Temperate coniferous forest
- Temperate deciduous forest
- Temperate forest
- Temperate grasslands, savannas, and shrublands
- Temperate rainforest
- Temperature measurement
- Temperature
- Temple menorah
- Temple Mount
- Temple of Artemis
- Temple of Confucius
- Temple of Edfu
- Temple
- Temporal lobe
- Tempskya
- Temryuk
- Temuco
- Ten Commandments
- Ten Great Campaigns
- Ten Kate
- Tenaille
- Tenant farmer
- Tenant-right
- Tencent QQ
- Tencent
- Tench
- Tender Is the Night
- Tendon
- Tendril
- Tenerife
- Tengchong
- Tengri
- Tengrism
- Tengu
- Teniers
- Tenison
- Tennessee River
- Tennessee
- Tennessine
- Tennis Court Oath
- Tennis elbow
- Tennis
- Tenochtitlan
- Tenor
- Tenorite
- Tenrec
- Tenrikyo
- Tension (physics)
- Tensor calculus
- Tensor
- TensorFlow
- Tent
- Teofilo Folengo
- Teotihuacan
- Tephritidae
- Tepidarium
- Terabit
- Terahertz radiation
- Terai
- Teraphim
- Teratornithidae
- Terbium
- Terceira Island
- Terengganu
- Terentianus
- Terenzio, Count Mamiani della Rovere
- Teresa of Ávila
- Teresina
- Tereus
- Terlizzi
- Term (architecture)
- Term limit
- Terma (religion)
- Terminal mode
- Terminator (genetics)
- Terminator (solar)
- Termite
- Tern
- Ternary numeral system
- Ternate
- Terni
- Ternopil Oblast
- Terpander
- Terpene
- Terpenoid
- Terra Australis Orogen
- Terrace (earthworks)
- Terrace (geology)
- Terracina
- Terracotta Army
- Terracotta
- Terrain
- Terramare culture
- Terrassa
- Terregles
- Terrestrial crab
- Terrestrial planet
- Terrestrial television
- Terrier
- Territorial Abbey of Monte Oliveto Maggiore
- Territorial claims in Antarctica
- Territorial disputes in the South China Sea
- Territory of New Guinea
- Terrorism
- Terry (dog)
- Tertiary education
- Tertiary
- Tertön
- Tesla (unit)
- Tesla, Inc.
- Tess of the d'Urbervilles
- Tessellation
- Tesseract
- Test Act
- Test particle
- Testaments of the Three Patriarchs
- Testaments of the Twelve Patriarchs
- Testamentum Domini
- Testicle
- Testicular cancer
- Testosterone
- Tests of general relativity
- Testudo (genus)
- Tet Offensive
- Tetanus
- Tethys (moon)
- Tethys Ocean
- Teton Range
- Tétouan
- Tetra
- Tetrachromacy
- Tetraclinis
- Tetractinellida
- Tetracycline antibiotics
- Tetracycline
- Tetradymite
- Tetraethyl pyrophosphate
- Tetraethyllead
- Tetragonal crystal system
- Tetrahedral molecular geometry
- Tetrahedrite
- Tetrahedron
- Tetrahydrofuran
- Tetraodontidae
- Tetraodontiformes
- Tetraoxygen
- Tetrapod
- Tetrapulmonata
- Tetraquark
- Tetrasodium EDTA
- Tetrigidae
- Tettigoniidae
- Teutonic Order
- Tevatron
- Tewfik Pasha
- TeX
- Texaco Star Theater
- Texas A&M University
- Texas annexation
- Texas barrier islands
- Texas Longhorn
- Texas Revolution
- Texas
- Text comics
- Text file
- Text messaging
- Text mode
- Textbook
- Textile arts
- Textile manufacturing
- Textile printing
- Textile
- Teyateyaneng
- Tezcatlipoca
- Tezpur
- TGV
- Thai basil
- Thái Bình
- Thai language
- Thái Nguyên
- Thai script
- Thailand
- Thaïs (opera)
- Thalassery
- Thalassocnus
- Thalassodromeus
- Thalattosauria
- Thallium
- Thallus
- Thalweg
- Thalys
- Thandwe
- Thane
- Thanesar
- Thanjavur
- Thanksgiving
- Thapsacus
- Thar Desert
- Tharandt
- Thargelia
- Tharparkar
- Tharros
- Thasos
- That'll Be the Day
- Thaumaturgy
- Thayet
- The $64,000 Question
- The 120 Days of Sodom
- The 400 Blows
- The A-Team
- The Addams Family (1964 TV series)
- The Adventures of Augie March
- The Adventures of Ozzie and Harriet
- The Adventures of Pinocchio
- The Adventures of Prince Achmed
- The Adventures of Sherlock Holmes
- The Adventures of Tintin
- The Adventures of Tom Sawyer
- The Age of Innocence
- The Age
- The Alchemist (novel)
- The Amazing Adventures of Kavalier & Clay
- The Amazing Race (American TV series)
- The Ambassadors (Holbein)
- The Ambassadors
- The American Journal of Clinical Nutrition
- The Anarchy
- The Anatomy Lesson of Dr. Nicolaes Tulp
- The Andy Griffith Show
- The Apartment
- The Apprentice (American TV series)
- The Apu Trilogy
- The Archers
- The Armed Man
- The Art of Computer Programming
- The Art of Fugue
- The Art of Painting
- The Art of War
- The arts
- The Asahi Shimbun
- The Astrophysical Journal
- The Atlantic
- The Autobiography of Alice B. Toklas
- The Autobiography of Malcolm X
- The Axis of Perdition
- The Bacchae
- The Bachelor (American TV series)
- The Bahamas
- The Ballad of Sexual Dependency
- The Barber of Seville
- The Barque of Dante
- The Battle of Algiers
- The Beatles (album)
- The Beatles
- The Beheading of St John the Baptist (Caravaggio)
- The Bell Jar
- The Benny Hill Show
- The Best Years of Our Lives
- The Beverly Hillbillies
- The Big Bang Theory
- The Big Buddha (Hong Kong)
- The Big Lebowski
- The Big Sleep
- The Birds (play)
- The Birds of America
- The Birth of a Nation
- The Birth of Venus (Bouguereau)
- The Birth of Venus
- The Birthday Party (play)
- The Blitz
- The Blue Boy
- The Blue Danube
- The Blue Marble
- The BMJ
- The Bob Newhart Show
- The Bold and the Beautiful
- The Bonfire of the Vanities
- The Book of Disquiet
- The Book of Good Love
- The Book of Healing
- The Book of the City of Ladies
- The Boondocks (2005 TV series)
- The Boston Globe
- The Brady Bunch
- The Bride Stripped Bare by Her Bachelors, Even
- The Bridge on the Drina
- The Bridge on the River Kwai
- The Bridges of Madison County
- The Brief Wondrous Life of Oscar Wao
- The Bronco Buster
- The Bronx
- The Brothers Karamazov
- The Bubble Boy (Seinfeld)
- The Bund (TV series)
- The Bund
- The Burghers of Calais
- The Burial of the Count of Orgaz
- The Cabinet of Dr. Caligari
- The Call of the Wild
- The Calling of St Matthew
- The Canterbury Tales
- The Cantos
- The Card Players
- The Carnival of the Animals
- The Carol Burnett Show
- The Carracci
- The Castle (novel)
- The Castle of Otranto
- The Cat in the Hat
- The Catcher in the Rye
- The Caucasian Chalk Circle
- The Charterhouse of Parma
- The Children's Museum of Indianapolis
- The Chosun Ilbo
- The Christian Science Monitor
- The Chronicles of Narnia
- The Church of Jesus Christ of Latter-day Saints
- The Climax (illustration)
- The Cloud of Unknowing
- The Clouds
- The Coca-Cola Company
- The Color Purple
- The Comedy of Errors
- The Common Sense Book of Baby and Child Care
- The Communist Manifesto
- The Conscience of a Conservative
- The Corrections
- The Cosby Show
- The Count of Monte Cristo
- The Crab
- The Creation (Haydn)
- The Creation of Adam
- The Crocodile Hunter
- The Crucible
- The Cult of the Self
- The Cumbraes
- The Da Vinci Code
- The Daily Show
- The Daily Telegraph
- The Dallas Morning News
- The Dark Knight
- The Dark Side of the Moon
- The Daughter of Time
- The Death and Life of Great American Cities
- The Death of Ivan Ilyich
- The Death of Marat
- The Death of Socrates
- The Decameron
- The Decline of the West
- The Deer Hunter
- The Denver Post
- The Descent of Man, and Selection in Relation to Sex
- The Diary of a Young Girl
- The Dick Cavett Show
- The Dick Van Dyke Show
- The Dinner Party
- The Dispossessed
- The Doctor (Doctor Who)
- The Dong-a Ilbo
- The Double Helix
- The Dream of the Fisherman's Wife
- The Dreaming
- The Dukeries
- The Dukes of Hazzard
- The Economic Times
- The Economist
- The Ed Sullivan Show
- The Education of Henry Adams
- The Egyptian
- The Electric Kool-Aid Acid Test
- The Elements of Style
- The Elephant Celebes
- The Elevation of the Cross (Rubens)
- The Emperor's New Clothes
- The Empire Strikes Back
- The Entertainer (rag)
- The Europeans
- The Exodus
- The Exorcist
- The Faerie Queene
- The Fairly OddParents
- The Falling Man
- The Falling Soldier
- The Farm (Miró)
- The Fault in Our Stars
- The Feast of the Gods
- The Federalist Papers
- The Feminine Mystique
- The Fens
- The Feynman Lectures on Physics
- The Fighting Temeraire
- The Figurine
- The Firebird
- The Flintstones
- The Forsyte Saga
- The Four Seasons (Poussin)
- The Four Seasons (Vivaldi)
- The Fresh Prince of Bel-Air
- The Fronde
- The Funnies
- The Gambia
- The Garden of Earthly Delights
- The Gates of Hell
- The General (1926 film)
- The General Theory of Employment, Interest and Money
- The Ginger Man
- The Girl from Ipanema
- The Girl with the Dragon Tattoo
- The Gleaners
- The Godfather Part II
- The Godfather
- The Gold Rush
- The Golden Ass
- The Golden Bough
- The Golden Girls
- The Golden Notebook
- The Good Earth
- The Good Soldier Švejk
- The Good Soldier
- The Good, the Bad and the Ugly (soundtrack)
- The Good, the Bad and the Ugly
- The Goon Show
- The gospel
- The Graduate
- The Grapes of Wrath
- The Great Dictator
- The Great Gatsby
- The Great Wave off Kanagawa
- The Gross Clinic
- The Guardian
- The Guianas
- The Gulag Archipelago
- The Hague
- The Handmaid's Tale
- The Hankyoreh
- The Hay Wain
- The Heart Is a Lonely Hunter
- The Hero with a Thousand Faces
- The Hills (TV series)
- The Hind and the Panther
- The Hindu
- The Histories (Polybius)
- The History of the Decline and Fall of the Roman Empire
- The History of the Standard Oil Company
- The History of Tom Jones, a Foundling
- The Hitchhiker's Guide to the Galaxy (radio series)
- The Hobbit
- The Hollywood Reporter
- The Holocaust
- The Home Depot
- The Honeymooners
- The Horse in Motion
- The Hound of the Baskervilles
- The House of Mirth
- The House of the Rising Sun
- The House of the Spirits
- The Howard Stern Show
- The Human Condition (film series)
- The Hunchback of Notre-Dame
- The Hunger Games (novel)
- The Hunters in the Snow
- The Hustler (film)
- The Idiot
- The Imitation of Christ
- The Importance of Being Earnest
- The Incoherence of the Incoherence
- The Incoherence of the Philosophers
- The Internationale
- The Interpretation of Dreams
- The Iron Bridge
- The Jazz Singer
- The Jeffersons
- The Jetsons
- The Joe Rogan Experience
- The Journal of Philosophy
- The Joy Luck Club (novel)
- The Joy of Painting
- The Jungle Book
- The Katzenjammer Kids
- The Kid (1921 film)
- The Kiss (Hayez)
- The Kiss (Klimt)
- The Kiss (Rodin sculpture)
- The Kite Runner
- The Knight in the Panther's Skin
- The Kyle and Jackie O Show
- The Lancet
- The Last Judgment (Michelangelo)
- The Last of the Mohicans
- The Last Rose of Summer
- The Last Samurai (novel)
- The Last Supper (Leonardo)
- The Legend of Sleepy Hollow
- The Leopard
- The Liberal Imagination
- The Life and Opinions of Tristram Shandy, Gentleman
- The Lion King (musical)
- The Lion King
- The Little Foxes
- The Little Mermaid (statue)
- The Little Mermaid
- The Little Prince
- The Lone Ranger (TV series)
- The Lord of the Rings (film series)
- The Lord of the Rings
- The Love Boat
- The Love Embrace of the Universe, the Earth (Mexico), Myself, Diego, and Señor Xolotl
- The Magic Flute
- The Magic Mountain
- The Maltese Falcon (1941 film)
- The Maltese Falcon (novel)
- The Man from Snowy River (poem)
- The Man Without Qualities
- The Maritimes
- The Marriage of Figaro
- The Martyrdom of Saint Symphorian
- The Mary Tyler Moore Show
- The Massacre at Chios
- The Master and Margarita
- The Matrix
- The Mature Age
- The Maxims of Ptahhotep
- The Merchant of Venice
- The Mercury Theatre on the Air
- The Merry Wives of Windsor
- The Message (Grandmaster Flash and the Furious Five song)
- The Metamorphosis
- The Mill on the Floss
- The Miseducation of Lauryn Hill
- The Mod Squad
- The Moon Represents My Heart
- The Motherland Calls
- The Mountain
- The Mousetrap
- The Moviegoer
- The Munsters
- The Muppet Show
- The Murder of Roger Ackroyd
- The Musicians (Caravaggio)
- The Mysterious Affair at Styles
- The Naked and the Dead
- The Name of the Rose
- The Nation
- The Neverending Story
- The New Church (Swedenborgian)
- The New Colossus
- The New England Journal of Medicine
- The New Republic
- The New York Review of Books
- The New York Times
- The New Yorker
- The Night of the Hunter (film)
- The Night Watch
- The Nikkei
- The Ninth Wave
- The Nutcracker
- The Odd Couple (1970 TV series)
- The Odd Couple (play)
- The Office (American TV series)
- The Old Man and the Sea
- The Onion
- The Open Society and Its Enemies
- The Oprah Winfrey Show
- The Origins of Totalitarianism
- The Osbournes
- The Owl and the Nightingale
- The Partridge Family
- The Passion of Joan of Arc
- The Peacock Room
- The Pearl-Qatar
- The Pentagon
- The Persians
- The Persistence of Memory
- The Phantom of the Opera (1986 musical)
- The Phantom
- The Phil Donahue Show
- The Philosophical Review
- The Physical Impossibility of Death in the Mind of Someone Living
- The Picture of Dorian Gray
- The Pilgrim's Progress
- The Plague (novel)
- The Planets
- The Playboy of the Western World
- The Pond—Moonlight
- The Portrait of a Lady
- The Potato Eaters
- The Powerpuff Girls
- The Price Is Right
- The Prime of Miss Jean Brodie (novel)
- The Prince and the Pauper
- The Prince
- The Priory City of Lincoln Academy
- The Problem We All Live With
- The Producers (musical)
- The Prophet (book)
- The Protectorate
- The Raft of the Medusa
- The Rape of Proserpina
- The Rape of the Lock
- The Raven Cycle
- The Raven
- The Real World (TV series)
- The Red and the Black
- The Red Badge of Courage
- The Remains of the Day
- The Ren & Stimpy Show
- The Return of the Prodigal Son (Rembrandt)
- The Returned (French TV series)
- The Rime of the Ancient Mariner
- The Rise and Fall of Ziggy Stardust and the Spiders from Mars
- The Rite of Spring
- The Road to Serfdom
- The Road
- The Rocky Horror Picture Show
- The Ruins of Athens
- The Rules of Sociological Method
- The Rules of the Game
- The Rush Limbaugh Show
- The Salvation Army
- The Sandman (comic book)
- The Satanic Verses
- The Scarlet Letter
- The School of Athens
- The Science of Nature
- The Scream
- The Sea of Fertility
- The Searchers
- The Seattle Times
- The Second Coming (poem)
- The Second Sex
- The Selfish Gene
- The Seven Storey Mountain
- The Seventh Seal
- The Shadow
- The Shawshank Redemption
- The Shining (film)
- The Silence of the Lambs (film)
- The Simple Life
- The Simpsons
- The Skin of Our Teeth
- The Slave Ship
- The Sleeping Beauty (ballet)
- The Sleeping Gypsy
- The Smurfs (1981 TV series)
- The Smurfs
- The Snow Queen
- The Son of Man
- The Song of Hiawatha
- The Song of Roland
- The Song of the Volga Boatmen
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- Tragedy
- Tragopan
- Tragus (plant)
- Trail of Tears
- Trail
- Trailer Park Boys
- Train station
- Train
- Training and development
- Trajan's Bridge
- Trajan's Forum
- Trajano Boccalini
- Trajectory
- Tram
- Trần dynasty
- Trance music
- Trance
- Tranent
- Trani
- Trans-African Highway network
- Trans-Australian Railway
- Trans-Caspian railway
- Trans-European high-speed rail network
- Trans-European Transport Network
- Trans-Hudson orogeny
- Trans-Mexican Volcanic Belt
- Trans-Mongolian Railway
- Trans-Neptunian object
- Trans-Saharan trade
- Trans-Siberian Railway
- Trans–New Guinea languages
- Transantarctic Mountains
- Transatlantic telegraph cable
- Transbaikal
- Transcaspian Oblast
- Transcendental number
- Transcontinental railroad
- Transcription (biology)
- Transcription factor
- Transducer
- Transfer of sovereignty over Macau
- Transfer principle
- Transfer RNA
- Transfinite induction
- Transform fault
- Transformer
- Transhumanism
- Transistor radio
- Transistor–transistor logic
- Transistor
- Transit of Mercury
- Transit of Venus
- Transit-oriented development
- Transition from Ming to Qing
- Transition metal
- Transition state theory
- Transition state
- Transition zone (Earth)
- Transitional fossil
- Transitional justice
- Transitive relation
- TransJakarta
- Translatio imperii
- Translation (biology)
- Translation
- Transliteration
- Transmashholding
- Transmedia storytelling
- TransMilenio
- Transmissible spongiform encephalopathy
- Transmission coefficient
- Transmission Control Protocol
- Transmission electron microscopy
- Transmission line
- Transmission of the Greek Classics
- Transmission system operator
- Transmission tower
- Transmitter
- Transnistria
- Transparency (human–computer interaction)
- Transparency and translucency
- Transparency International
- Transphobia
- Transphonologization
- Transpiration
- Transplanter
- Transplanting
- Transport hub
- Transport Layer Security
- Transport phenomena
- Transport
- Transportation engineering
- Transportation theory (mathematics)
- Transposable element
- Transpose
- Transuranium element
- Transverse mode
- Transverse rib
- Transverse wave
- Transylvania
- Transylvanian rugs
- Trap music
- Trapeze
- Trapeziidae
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- Trapezoid
- Trapezophoron
- Trapping
- TRAPPIST-1
- Trappists
- Traquair
- Trass
- Trauma center
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- Traumatology
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- Tre Taverne
- Treadmill
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- Treasure Island
- Treatise
- Treaty of Aix-la-Chapelle (1668)
- Treaty of Brest-Litovsk
- Treaty of Jassy
- Treaty of Lisbon
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- Treaty of Rastatt
- Treaty of San Francisco
- Treaty of Tordesillas
- Treaty of Versailles
- Treaty of Waitangi
- Treaty of Zaragoza
- Treaty
- Trębin
- Trebinje
- Třeboň
- Trebuchet
- Tree (data structure)
- Tree (graph theory)
- Tree fern
- Tree frog
- Tree kingfisher
- Tree marriage
- Tree of life (biblical)
- Tree of life (Kabbalah)
- Tree of the knowledge of good and evil
- Tree squirrel
- Tree-kangaroo
- Tree
- Treehopper
- Trees in mythology
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- Treeswift
- Tréguier
- Trematoda
- Trench warfare
- Trench
- Trente et Quarante
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- Trespass to land
- Trespass
- Trett
- Tretyakov Gallery
- Treviglio
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- Triadobatrachus
- Triage
- Trial
- Triangle
- Triangular array
- Triangulum Australe
- Triangulum Galaxy
- Triangulum
- Triassic–Jurassic extinction event
- Triassic
- Triazine
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- Tribe
- Triberg im Schwarzwald
- Tribunal
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- Tribute act
- Triceratops
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- Trichomycetes
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- Triclinium
- Triconodon
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- Tridactylidae
- Trieste
- Trifid Nebula
- Triflic acid
- Triforium
- Trigger (firearms)
- Trigger (horse)
- Triggerfish
- Triglidae
- Triglyph
- Trigonal planar molecular geometry
- Trigonal pyramidal molecular geometry
- Trigonometric functions
- Trigonometry
- Trigonon
- Trigonotarbida
- Trikaya
- Trilobite
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- Trimerophytopsida
- Trimurti
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- Tringa
- Trinidad and Tobago
- Trinidad
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- Trinity College Dublin
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- Trinomial
- Triolet
- Trionychidae
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- Tripalmitin
- Tripartite Struggle
- Tripedalism
- Tripiṭaka
- Triple bond
- Triple junction
- Triple point
- Triple-alpha process
- Triplet oxygen
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- Tripoli
- Triptych of the Temptation of St. Anthony
- Tripura (princely state)
- Tripura
- Trireme
- Trisectrix
- Trisodium citrate
- Trisodium phosphate
- Tristan and Iseult
- Tristan da Cunha
- Tristan l'Hermite
- Tristan und Isolde
- Tristan
- Trisvabhāva
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- Triticale
- Tritium
- Triton (moon)
- Tritone
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- Triumvirate
- Trivial name
- Trnava
- Trochonema
- Troels Frederik Lund
- Trogir
- Trogon
- Trogossitidae
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- Troilus
- Troitsk
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- Trombiculidae
- Trombone
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- Trommel screen
- Tromsø
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- Troodontidae
- Tropaeolum
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- Tropic of Cancer
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- Tropical cyclone
- Tropical fish
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- Tropical rainforest
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- Troyon
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- Truck
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- Tuareg people
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- Tuberculosis
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- Tubifex
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- Tucson, Arizona
- Tucumán Province
- Tudigong
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- Tudor rose
- Tuesday
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- Tui na
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- Tulsa, Oklahoma
- Tulsidas
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- Tumulus
- Tun (unit)
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- Tundra
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- Tunicate
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- Tuol Sleng Genocide Museum
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- Tuple
- Tupolev Tu-154
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- Turan
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- Turbellaria
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- Turkic languages
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- Turkmen language
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- Turku
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- Turlough Lynagh O'Neill
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- Turmeric
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- Turrettini (surname)
- Turrid
- Turriff
- Turritella
- Turritellidae
- Turritopsis dohrnii
- Turtle
- Tuscania
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- Tuskegee, Alabama
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- Twelvefold way
- Twelver Shi'ism
- Twentieth-century theatre
- Twenty Love Poems and a Song of Despair
- Twenty Thousand Leagues Under the Seas
- Twenty-five (card game)
- Twi
- Twig
- Twilight (novel series)
- Twilight
- Twill
- Twin paradox
- Twin Peaks
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- Twin-lens reflex camera
- Twinaxial cabling
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- Twinkling
- Twist (dance)
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- Twittering Machine
- Two-body problem
- Two-dimensional Euclidean space
- Two-factor theory
- Two-stroke engine
- Tylor
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- Tyndale Bible
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- Type (model theory)
- Type 1 diabetes
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- Type I and type II errors
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- Typee
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- Typewriter
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- Typhoon Nari (2001)
- Typhus
- Typographical error
- Typography
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- Týr
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- Tyrannosauroidea
- Tyrannosaurus
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- Tyrtaeus
- Tyuleny Archipelago
- Tyuleny Island (Caspian Sea)
- Tyumen
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- U-boat campaign
- U-shaped valley
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- U.S.A. (trilogy)
- Uakari
- Ubaid period
- Ubangi River
- Ubbo Emmius
- Uber
- Ubiquitin
- UBV photometric system
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- UEFI
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- Ufa
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- UFO religion
- Uga (mascot)
- Uganda
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- Ulster
- Ultimate fate of the universe
- Ultimogeniture
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- Ultracentrifuge
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- Ultrafilter
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- Ultraviolet
- Ulugh Beg
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- Umeå
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- Un Chien Andalou
- Unbarred spiral galaxy
- Unbibium
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- Uncertainty principle
- Uncertainty
- Unchained Melody
- Uncle Sam
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- Under the Volcano
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- Undercroft
- Undergraduate degree
- Underground lake
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- Undergrounding
- Undersea tunnel
- Underworld
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- UNICEF
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- Uniform
- Unilever
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- Union Jack
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- Unit 731
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- United States
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- Universe
- Université catholique de Louvain
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- Unix time
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- Unna
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- Unreliable narrator
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- Unsolved Mysteries
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- Up from Slavery
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- Ur
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- URL redirection
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- Uroplatinae
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