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- "The Other"
- "Unshackled!"
- 1.8.7
- 12AU7
- 12AX7
- 12AY7
- 13
- 1864 Civil War Request for Pay
- 1898–99 Scottish Districts season
- 1908 Georgia Bulldogs football team
- 1942 Declaration by the United Nations
- 1984
- 1990 Invasion of Iraq
- 2004
- 2010s (decade)
- 2010s elections around the world
- 2011 Major League Baseball wild card chase
- 2012 (movie)
- 2018
- 666
- 6BQ5
- 6L6
- 6V6
- 7
- 9-volt battery
- 96Ace
- A
- A. C. Bhaktivedanta Swami Prabhupada
- AAA battery
- AAPT
- AASraw
- AA battery
- AFL
- AK-47
- AK1200
- AOL
- ASIS
- A Book of Escapes And Hurried Journeys/The Railway Raid in Georgia
- A Course in Miracles
- A Declaration of the Immediate Causes which Induce and Justify the Secession of the State of Mississippi from the Federal Union
- A League of Their Own
- A Shot of Brandi
- A page with a picture
- A short history of the Confederate States of America
- Aa
- Aardvark
- Abandoned footwear
- Abilene paradox
- Abject art
- Abolitionism
- Abortion
- AboutUs
- Abraham Lincoln
- Abraham Lincoln's Cooper's Union Speech
- Abraham Lincoln's First Inaugural Address
- Abraham Lincoln's First State of the Union Address, 1861
- Abraham Lincoln's Fourth State of the Union Address, 1864
- Abraham Lincoln's Gettysburg Address
- Abraham Lincoln's House Divided Speech
- Abraham Lincoln's Last Public Speech, April 11, 1865
- Abraham Lincoln's Second Inaugural Address
- Abraham Lincoln's Second State of the Union Address, 1862
- Abraham Lincoln's Third State of the Union Address, 1863
- Abraham Lincolns Speech on the Repeal of the Missouri Compromise
- Abramo Colorni
- Academia
- Acceptance mark
- Acetone
- Acid naming table
- Acoma Crape Myrtle
- Acoustics and Noise Control (book)
- Actinidia Polygama
- Actinopus taragui
- Actor
- Acupuncture
- AdSense
- Adenovirus serotype 36
- Adjective
- Administrative divisions of Nepal
- Adolf Eichmann
- Adolf Hitler
- Adolph "Bud" Herseth
- Adriatic Sea
- Advertisement
- Aea.ltd
- Aechmea Bromeliifolia
- Aeonium
- Aerangis Orchids
- Aerobic exercise
- Aerosol
- Aerospace engineering
- Afghanistan
- Africa
- African Daisy
- African Fern Pine
- African Milk Tree
- Agatha Christie
- Age of Enlightenment
- Age of Exploration
- Agitprop! Records
- Ahmadinejad
- Aikana
- Air filter
- Air pollution
- Airplane
- Akuntsu
- Al Bundy
- Al Qaeda
- Alabama
- Alabama Ordinance of Secession
- Alaric
- Alaska
- Albania
- Albert Einstein
- Albert Speer
- Albino
- Alcohol
- Alex Salmond
- Alexa Internet
- Alexander Burnes
- Alexander Graham Bell
- Alexander H. Stephens' Cornerstone Address
- Alexander the Great
- Alfred Einstein
- Alfred Jodl
- Alfred Yarrow
- Algal bloom
- Algebra
- Algeria
- Alhana Starbreeze
- Alice Cullen
- Alice Springs
- Alice in Chains
- Alien
- Aliens
- Alix Perez
- Alleran Waylan
- Allies of World War II
- Alloy
- Alloys
- Almighty dollar
- Aloe
- Alonso de Hojeda
- Alpaca
- Alsace-Lorraine
- Alter-G
- Alternative search engine
- Alternatives to Wikipedia
- Aluminum
- Alzheimer's Disease
- Amalekite
- Amanaye
- Amazon
- Amazon River
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- Amen drum loop
- American Civil War
- American Eagle Outfitters
- American Idol
- American Mathematical Society
- American cheese
- American exceptionalism
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- Americocentric
- Amerigo Vespucci
- Amethyst
- Amex
- Amilton de Cristo
- Amini Cishugi
- Amiright
- Amistad (1841)
- Amnesty International
- Amnesty to Political or State Prisoners
- Amon Goeth
- Amos Parnell
- Amphibian
- Amyotrophic lateral sclerosis
- An Athonite Gerontikon
- Anakin Skywalker
- Analog Man (instrument maker)
- Anambe
- Anarchism
- Anarchist Library
- Ancient Canaanite religion
- Andorra
- Andre the Giant
- Andrew Jackson
- Andrew Johnson
- Andromeda Galaxy
- Andy Narell
- Angband
- Angel
- Angela Zigahl
- Anger
- Angola
- Angus Ellis Taylor
- Angus Third Pounder
- Animal
- Animal Rights
- Anna Popplewell
- Anonymous
- Another Account of the Great Battle of Antietam
- Anschluss
- AntWiki
- Antal Dorati
- Antarctica
- Anthropogenic
- Anthroposophy
- Anti-Tech Revolution: Why and How
- Anti-abortion terrorism
- Anti-consumerism
- Anti-psychiatry
- Antibiotic
- Antichristus
- Antidote
- Antifreeze coolant
- Antigua and Barbuda
- Antisemitism
- Antoine Lavoisier
- Antonio Abbatini
- Antonio Raposo Tavares
- Antonio Vivaldi
- Antwerp
- Anus
- Apaches
- Aparai
- Apathy
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- Apinaje
- Apocalypse
- Apocatastasis
- Apollo
- Apollo Creed
- Apollo and Dionysus
- Apollo program
- Appeasement
- Apple
- Apple Incorporated
- Applebee's
- Approval rating
- Apps
- Apurina
- Aqua Teen Hunger Force
- Aqua Teen Hunger Force: Movie Film for Theaters
- Arara
- Arawete
- Arbitration
- Arby's
- Arcadia
- Arcani
- Archimedes
- Architect
- Architecture
- Archtop guitar
- Arctic Ocean
- Ardrana
- Area 51
- Arecibo Observatory
- Argentina
- Arguments2
- Argumentum ad populum
- Arianism
- Arikapu
- Aristotle
- Arithmetic
- Arizona
- Arizona Territory Ordinance of Secession
- Arkansas
- Arkansas Ordinance of Secession
- Arm
- Armadillo
- Armageddon
- Armaments Abandoned in Afghanistan by the United States
- Armenia
- Armenian Genocide
- Arminius
- Armor
- Arnold v. Mundy
- Arrested Development
- Art
- Art Deco
- Art Vandelay
- Art movement
- Artemis Fowl
- Arthur Quiller-Couch
- Arthur Treacher's
- Articles for Deletion
- Artificial gravity
- Artificial intelligence
- Artificial turf
- Artillery
- Artist
- Arua
- Aruba
- Aryan
- Asaccus kurdistanensis
- Ash Ketchum
- Ashaninka
- Asia
- Asia Minor
- AsianGlow
- Asperger's syndrome
- Assault rifle
- Association of Amalgamated Territorial Communities
- Astronomical unit
- Astronomy
- Atari
- Atari 2600
- Atheism
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- Atikum
- Atlantic Ocean
- Atlantic Wall
- Atlantis
- Atmosphere
- Atmospheric jungle
- Atom
- Atomic bomb
- Atriopeptin
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- Attack on Pearl Harbor
- Attention
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- Attorney General v Davy
- Aubrey de Grey
- Audio (artist)
- Audio Access FM
- Audrey Hepburn
- Auggie
- Aum Shinrikyo
- Auntie Reviews
- Auras
- Austar
- Australia
- Australian Idol
- Australian Rules football
- Austria
- Austria-Hungary
- Autism
- Auto-Tune
- Auto-wah
- Automobile engine
- Automotive engineering
- Autonomous vehicles