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| Angular momentum (classical) | Angular momentum (classical)/Approval | Angular momentum (disambiguation) |
| Angular momentum (quantum) | Angular momentum (quantum)/Approval | Angular momentum coupling |
| Angular momentum coupling/Approval | Animal | Animal/Approval |
| Animal/Definition | Animal fancy | Animal fancy/Approval |
| Animal fancy/Definition | Animalia | Animalia/Definition |
| Animalier | Animalier/Approval | Animalier/Bibliography |
| Animalier/Definition | Animalier/Related Articles | |
| Anime | Anion | Anion/Approval |
| Anion/Definition | Ankylosing spondylitis | |
| Ann Coulter | Ann Coulter/Approval | Ann Coulter/Definition |
| Ann Hamilton | Ann Hamilton/Approval | Ann Hamilton/Bibliography |
| Ann Hamilton/Definition | Annales School | |
| Annales School/Approval | ||
| Annapolis Conference | Annapolis Conference/Approval | Annapolis Conference/Definition |
| Anne, Princess Royal/Definition | Anne Boleyn | |
| Anne Boleyn/Definition | Anne of Austria | Anne of Austria/Approval |
| Anne of Austria/Definition | Annie Smith Peck | Annie Smith Peck/Approval |
| Anomia | Anomia/Definition | Anomia/Related Articles |
| Anonymity | Anonymity/Approval | Anonymity/Bibliography |
| Anonymity/Definition | Anshan | Anshan/Approval |
| Antarctica | Antarctica/Approval | Antarctica/Definition |
| Antarctica/External Links | Antares | Antares/Approval |
| Ante-Bellum South | Ante-Bellum South/Approval | Ante-Bellum South/Bibliography |
| Ante Pavelić | Anterior Cruciate Ligament | |
| Anterior pituitary | Anterior pituitary/Approval | |
| Anterior pituitary/Definition | Anthony Fokker | Anthony Fokker/Approval |
| Anthony Fokker/Bibliography | Anthony Fokker/External Links | Anthony Fokker/Related Articles |
| Anthrax | Anthropological linguistics | Anthropological linguistics/Approval |
| Anthropology | Anthropology/Approval | Anthropology/Bibliography |
| Anthropology/Definition | Anthropology/External Links | |
| Anti-Saloon League | Anti-Saloon League/Approval | |
| Anti-Saloon League/Bibliography | Anti-Saloon League/Definition | Anti-Saloon League/Draft |
| Anti-Saloon League/External Links | Anti-Saloon League/Related Articles | |
| Anti-air warfare | ||
| Anti-air warfare/Definition | Anti-aircraft artillery | Anti-aircraft artillery/Approval |
| Anti-aircraft artillery/Definition | Anti-ballistic missile | |
| Anti-intellectualism | Anti-intellectualism/Approval | |
| Anti-intellectualism/Bibliography | Anti-intellectualism/Definition | Anti-intellectualism/Related Articles |
| Anti-radiation missile | Anti-radiation missile/Approval | |
| Anti-radiation missile/Definition | Anti-radiation missile/Related Articles | |
| Anti-shipping missile | Anti-shipping missile/Definition | Anti-submarine warfare |
| Anti-submarine warfare/Definition | Anti-surface warfare | Anti-surface warfare/Definition |
| Anti-tank missile | Anti-tank missile/Definition | |
| Antibacterial | ||
| Antibacterial/Approval | Antibiotic | Antibiotic/Approval |
| Antibiotic/Definition | Antibiotic resistance | Antibiotic resistance/Definition |
| Anticoagulant | ||
| Anticoagulant/Approval | Anticoagulant/Definition | Anticoagulant/Related Articles |
| Anticoagulation/Approval | Antidepressant | |
| Antidepressant/Approval | Antidepressant/Definition | |
| Antidiuretic hormone/Approval | Antiemetic | Antigen |
| Antigen/Approval | Antigen/Definition | Antihero |
| Antihero/Definition | Antikythera | Antikythera/Video |
| Antimony/Atomic mass | Antimony/Atomic number | Antimony/Atomic symbol |
| Antimony/Boiling point | Antimony/Electron configuration | Antimony/Electronegativity |
| Antimony/Elemental Class | Antimony/Standard phase | Antineoplastons |
| Antineoplastons/Approval | Antineutrophil cytoplasmic antibody | |
| Antisocial personality disorder | Antisocial personality disorder/Approval | |
| Antisymmetrizer | Antisymmetrizer/Approval | Antitank weapon/Definition |
| Antitrust | Antitrust/Approval | |
| Antitrust/Bibliography | Antitrust/Definition | Antitrust/Documents |
| Antitrust/Related Articles | Antiviral/Approval | |
| Antiviral drug | Antiviral drug/Approval | Antiviral drug/Catalogs |
| Antiviral drug/Definition | Antlia | |
| Antlia/Approval | Antlia/Definition | Antoine-Henri Jomini |
| Anton Geesink | Anton Geesink/Definition | Anton Wilhelm Amo |
| Anton Wilhelm Amo/Approval | ||
| Antoni Gaudí | Antoni Gaudí/Approval | Antoni Gaudí/Definition |
| Antoni Gaudí/Gallery | Antoni Gaudí/Works | |
| Antonie van Leeuwenhoek | Antonie van Leeuwenhoek/Approval | Antonie van Leeuwenhoek/Definition |
| Antonie van Leeuwenhoek/External Links | ||
| Anxiety | Anxiety/Approval | Anxiety/Definition |
| Anycast | Anycast/Definition | |
| Aomori prefecture | Aomori prefecture/Approval | Aomori prefecture/Definition |
| Aortic regurgitation | Aortic regurgitation/Approval | Apache HTTP Server |
| Apache HTTP Server/Approval | Apache HTTP Server/External Links | |
| Apache Software Foundation | Apache Software Foundation/Approval | Ape |
| Ape/Approval | Ape/Definition | Ape/Related Articles |
| Apennine peninsula | Apennine peninsula/Approval | Aphasia/Definition |
| Aphid | Aphid/Approval | Aplastic anemia |
| Aplastic anemia/Approval | Apollo (disambiguation) | |
| Apollo Command-Service Module | Apollo Command-Service Module/Approval | |
| Apollodorus | Apollodorus/Approval | Apollodorus/Definition |
| Apologetics | Apologetics/Definition | Apoptosis |
| Apoptosis/Approval | Apoptosis/Definition | Aporia |
| Aporia/Approval | Aporia/Definition | Apostrophe |
| Apostrophe/Approval | Apostrophe/Definition | Apostrophe/Related Articles |
| Appendicitis | Appendicitis/Approval | Appendicitis/Definition |
| Appian way | Appian way/Approval | |
| Apple (disambiguation) | Apple (fruit) | |
| Apple (fruit)/Approval | Apple (fruit)/Bibliography | Apple (fruit)/Definition |
| Apple (fruit)/External Links | Apple (fruit)/Gallery | Apple (fruit)/Related Articles |
| Apple (tree) | Apple (tree)/Definition | |
| Apple Inc. | Apple Inc./Approval | Apple Inc./Definition |
| Apple Macintosh | Apple Macintosh/Approval | Apple Macintosh/Definition |
| Apple Macintosh/External Links | Application Service Provider | Application Service Provider/Definition |
| Applied cognitive science/Definition | Applied linguistics | |
| Applied linguistics/Approval | Applied linguistics/Bibliography | Applied linguistics/Definition |
| Applied linguistics/External Links | Applied social sciences | |
| Applied social sciences/Approval | Approximation theory | |
| Approximation theory/Approval | Approximation theory/Definition | Approximation theory/Related Articles |
| Apraxia/Definition | Apus | Apus/Approval |
| Aquarius | Aquarius/Approval | |
| Aquatics | Aquatics/Approval | |
| Aquatics/Definition | Aquatics/Related Articles | Aqueous Wastes from Petroleum and Petrochemical Plants |
| Aqueous Wastes from Petroleum and Petrochemical Plants/Approval | Aqueous Wastes from Petroleum and Petrochemical Plants/Bibliography | Aqueous Wastes from Petroleum and Petrochemical Plants/Definition |
| Aqueous Wastes from Petroleum and Petrochemical Plants/External Links | Aqueous Wastes from Petroleum and Petrochemical Plants/Related Articles | |
| Aquifer | Aquifer/Approval | Aquifer/Definition |
| Aquifer/Related Articles | Aquila | Aquila/Approval |
| Aquitard | ||
| Aquitard/Approval | Ar-Ar | Ar-Ar/Approval |
| Ara | Ara/Approval | |
| Ara autocthones (Saint Croix Macaw) | Ara autocthones (Saint Croix Macaw)/Approval | Arab |
| Arab-Israeli Conflict | Arab-Israeli Conflict/Approval | |
| Arab/Approval | ||
| Arabic attack | Arabic attack/Definition | |
| Arabic language | ||
| Arabidopsis thaliana (Thale Cress) | Arabidopsis thaliana (Thale Cress)/Bibliography | Arabidopsis thaliana (Thale Cress)/Catalogs |
| Arabidopsis thaliana (Thale Cress)/Definition | Arabidopsis thaliana (Thale Cress)/External Links | Arabidopsis thaliana (Thale Cress)/Related Articles |
| Arad, Israel | Aragonese language | |
| Arain | Arain/Approval | Aralsk |
| Aralsk/Approval | Aralsk/Definition | Aramaic |
| Aramaic/Approval | Aramaic/Definition | |
| Aran (disambiguation) | Aran Islands/Definition | |
| Aran Valley | Aran Valley/Definition | Aran islands/Definition |
| Aranese Occitan | ||
| Arbitrage | Arbitrage/Approval | |
| Arbitrage/Definition | Arbitrary culture theory | Arbitrary culture theory/Approval |
| Arbitrary culture theory/Definition | Arbour/Definition | Arcade game |
| Arcade game/Approval | Arcade game/Definition | |
| Archaea | Archaea/Approval | |
| Archaeology | ||
| Archaeology/Approval | Archaeology/Definition | |
| Archery/Definition | Archipelago | |
| Archipelago/Approval | Architect | Architect/Approval |
| Architect/Bibliography | Architect/Definition | Architect/Related Articles |
| Architecture | Architecture/Approval | Architecture/Bibliography |
| Architecture/Definition | Architecture/External Links | Architecture/Related Articles |
| Architecture of the California Missions | Architecture of the California Missions/Approval | Architecture of the California Missions/Bibliography |
| Architecture of the California Missions/Related Articles | Architecture of the Song Dynasty | Architecture of the Song Dynasty/Approval |
| Arcology | Arcology/Approval | |
| Arcology/Definition | Arctic Bay | Arctic Bay/Definition |
| Arctic Ocean | Arctic Ocean/Approval | Arctic Ocean/Definition |
| Arcuate nucleus | ||
| Arcuate nucleus/Approval | Area of a triangle | Area of a triangle/Approval |
| Argentina | Argentina/Approval | Argentina/Bibliography |
| Argentina/Definition | Argentina/Related Articles | Arginine |
| Arginine/Approval | Arginine/Definition | Arginine/Related Articles |
| Arginine vasopressin receptor 1B | Arginine vasopressin receptor 1B/Approval | Arginine vasopressin receptor 1B/Definition |
| Arginine vasopressin receptor 1B/Related Articles | Argon | Argon/Approval |
| Argon/Atomic mass | Argon/Atomic number | Argon/Atomic symbol |
| Argon/Boiling point | Argon/Electron configuration | Argon/Electronegativity |
| Argon/Elemental Class | Argon/Standard phase | Argument |
| Argument/Approval | ||
| Argyll Robertson pupil/Definition | ||
| Ari Babakhanov | Ari Babakhanov/Bibliography | Ari Babakhanov/Definition |
| Ari Babakhanov/Video | Aries | Aries/Approval |
| Aries/Definition | Arik Einstein | |
| Arik Einstein/Approval | Aristocracy | Aristocracy/Definition |
| Aristolochic acid | Aristolochic acid/Approval | Aristolochic acid/Definition |
| Aristotle | Aristotle/Approval | Aristotle/Bibliography |
| Aristotle/Definition | Aristotle/Related Articles | Aristotle/Works |
| Arlington National Cemetery | Arlington National Cemetery/Approval | |
| Armadillo Aerospace | Armadillo Aerospace/Approval | Armed helicopter |
| Armed helicopter/Definition | Armenian Genocide | Armenian Genocide/Approval |
| Armenian Genocide/Bibliography | Armenian Genocide/External Links | Armenian Genocide/Related Articles |
| Armor-piercing, fin-stabilized, discarding-sabot | Armor (disambiguation) | Armor (materials)/Definition |
| Armor (materials/Definition | Armor (military branch) | Armor (military branch)/Definition |
| Armor (military unit/Definition | Armor (personal protective)/Definition | Armor (vehicle protective) |
| Armor (vehicle protective)/Definition | Armored fighting vehicle | Armored fighting vehicle/Definition |
| Armored personnel carrier | Armored personnel carrier/Definition | Armored vehicle/Definition |
| Arms control | Arms control/Definition | Army |
| Army/Approval | Army/Definition | Army/Related Articles |
| Army Battle Command System | Army Battle Command System/Definition | Army Cooperation Aviation |
| Army Cooperation Aviation/Definition | Army Coperation Aviation | Army National Guard (United States) |
| Army National Guard (United States)/Definition | Army Special Operations Command | |
| Army Special Operations Command/Definition | Army aviation | Army of the Republic of Viet Nam |
| Arne | Arne/Approval | |
| Arne (mythology) | Arne (mythology)/Approval | Arne (mythology)/Definition |
| Arne (name) | Arne (name)/Approval | |
| Arne Sithonis | Arne Sithonis/Approval | Arne Sithonis/Definition |
| Arnold J. Toynbee | Arnold J. Toynbee/Approval | |
| Aromatherapy | Aron Nimzowitsch | |
| Aron Nimzowitsch/Approval | Aron Nimzowitsch/Definition | |
| Arrhythmia | Arrhythmia/Approval | |
| Arrhythmia/Definition | Arsenic/Atomic mass | Arsenic/Atomic number |
| Arsenic/Atomic symbol | Arsenic/Boiling point | Arsenic/Electron configuration |
| Arsenic/Electronegativity | Arsenic/Elemental Class | Arsenic/Standard phase |
| Art | Art/Approval | Art/Definition |
| Art Furniture Alliance/Definition | Art Lundahl | Arte Povera |
| Arte Povera/Definition | Arte Povera/Related Articles | Artemis Fowl |
| Artemis Fowl/Approval | Artemisia vulgaris | |
| Artemisia vulgaris/Approval | Arthralgia | Arthralgia/Approval |
| Arthralgia/Definition | Arthritis | Arthritis/Approval |
| Arthritis/Definition | Arthrodynia | Arthrodynia/Approval |
| Arthropod/Definition | Arthropod metamorphosis | |
| Arthropod metamorphosis/Definition | Arthropoda | Arthropoda/Definition |
| Arthur's Seat | Arthur's Seat/Approval | Arthur's Seat/Definition |
| Arthur Altmeyer | Arthur Altmeyer/Approval | Arthur Altmeyer/Bibliography |
| Arthur Altmeyer/Definition | Arthur Altmeyer/Related Articles | Arthur Ashe |
| Arthur Conan-Doyle/Definition | Arthur Conan Doyle | Arthur Conan Doyle/Approval |
| Arthur Conan Doyle/Bibliography | Arthur Conan Doyle/External Links | Arthur Conan Doyle/Related Articles |
| Arthur Conan Doyle/Works | Arthur Griffith | Arthur Griffith/Approval |
| Arthur Radford/Definition | Arthur S. Link | |
| Arthur S. Link/Approval | Arthur Szyk | Arthur Szyk/Approval |
| Arthur Wardle | Arthur Wardle/Approval | Arthur Wardle/Definition |
| Arthur Wardle/Related Articles | Arthur Wardle/Works | |
| Articles of Confederation | Articles of Confederation/Approval | Articles of Confederation/Bibliography |
| Articles of Confederation/Definition | Artificial Intelligence Markup Language | Artificial Intelligence Markup Language/Approval |
| Artificial intelligence | Artificial intelligence/Approval | |
| Artificial intelligence/Definition | Artificial neural network | Artificial neural network/Approval |
| Artificial neuron | Artificial neuron/Approval | Artificial respiration |
| Artificial respiration/Definition | Artificial respiration/Related Articles | Artillery |
| Artillery/Definition | Artin L-function | Artin L-function/Approval |
| Artist's Colony, Darmstadt/Definition | Artist-in-residence | Arudou Debito |
| Arudou Debito/Bibliography | Arudou Debito/Definition | Arudou Debito/External Links |
| Arudou Debito/Related Articles | Arudou Debito/Video | Asahi Shimbun |
| Asahi Shimbun/Approval | Asana | |
| Asana/Approval | Asana/Related Articles | Asanga |
| Asanga/Approval | Ascites | |
| Ascites/Approval | Ascites/Definition | |
| Asclepiodotus (Stoic) | Asclepiodotus (Stoic)/Approval | Asclepiodotus (Stoic)/Definition |
| Asclepiodotus (disambiguation) | Asclepiodotus (physician) | Asclepiodotus (physician)/Approval |
| Asclepiodotus (physician)/Definition | Asclepiodotus of Alexandria | Asclepiodotus of Alexandria/Approval |
| Asclepiodotus of Alexandria/Definition | Asclepiodotus of Heraclea | Asclepiodotus of Heraclea/Approval |
| Asclepiodotus of Heraclea/Definition | Asclepiodotus of Lesbos | Asclepiodotus of Lesbos/Approval |
| Asclepiodotus of Lesbos/Definition | Ascorbic acid | Ascorbic acid/Approval |
| Ascorbic acid/Bibliography | Ascorbic acid/Definition | Ascorbic acid/External Links |
| Ascorbic acid/Related Articles | Ashanti (disambiguation) | |
| Ashanti (film) | Ashanti (film)/Approval | Ashanti (film)/Definition |
| Ashmore and Cartier Islands | ||
| Ashram system | Ashtanga | Ashtanga/Approval |
| Ashtanga/Definition | Ashtanga vinyasa yoga | Ashtanga vinyasa yoga/Approval |
| Asia | Asia/Approval | Asia/Definition |
| Asia Argento | Asia Argento/Approval | Asian Games/Definition |
| Asian elephant | Asian elephant/Approval | |
| Asif Ali Zardari | ||
| Asp (disambiguation) | ||
| Asparagine | Asparagine/Approval | Asparagine/Definition |
| Asparagine/Related Articles | Aspartame | Aspartame/Approval |
| Aspartame/Definition | Aspartame/Draft | |
| Aspartic acid | Aspartic acid/Approval | Aspartic acid/Definition |
| Aspartic acid/Related Articles | Aspartoacylase/Definition | |
| Asperger's syndrome | ||
| Asperger's syndrome/Approval | Asperger syndrome | |
| Asperger syndrome/Approval | Asperger syndrome/Definition | Asperger syndrome/External Links |
| Asphalt | Asphalt/Approval | |
| Aspirin | Aspirin/Approval | Aspirin/Definition |
| Asplenium scolopendrium | Asplenium scolopendrium/Approval | |
| Assassination of President John F. Kennedy | Assassination of President John F. Kennedy/Approval | |
| Assassination of President John F. Kennedy/Bibliography | Assassination of President John F. Kennedy/Definition | Assassination of President John F. Kennedy/External Links |
| Assassination of President John F. Kennedy/Related Articles | Assault rifle/Definition | Assembly Language |
| Assembly Language/Approval | Assignment Zero | |
| Assignment Zero/Approval | Assistant to the President for National Security Affairs | |
| Associated Legendre function | Associated Legendre function/Approval | Associated Legendre function/Definition |
| Associated Legendre function/Related Articles | ||
| Associated reproductive pattern | ||
| Associated reproductive pattern/Approval | Association/Definition | |
| Association football (soccer) | Association football (soccer)/Approval | |
| Association football (soccer)/Definition | Association football (soccer)/External Links | Association football (soccer)/Related Articles |
| Association of Electoral Administrators | Association of Electoral Administrators/Approval | Association of Southeast Asian Nations |
| Astatine | Astatine/Atomic mass | Astatine/Atomic number |
| Astatine/Atomic symbol | Astatine/Boiling point | Astatine/Definition |
| Astatine/Electron configuration | Astatine/Electronegativity | Astatine/Elemental Class |
| Astatine/Properties | Astatine/Properties/List | Astatine/Standard phase |
| Asthma | Asthma/Approval | |
| Astro Boy | Astrobiology | Astrobiology/Approval |
| Astrobiology/Definition | Astrocyte | Astrocyte/Bibliography |
| Astrocyte/Definition | Astrocyte/External Links | Astrocyte/Related Articles |
| Astrology | Astrology/Approval | Astrology/Definition |
| Astrology/Related Articles | Astronaut Glove Challenge | Astronaut Glove Challenge/Approval |
| Astronomical Unit | Astronomical Unit/Approval | Astronomy |
| Astronomy/Approval | Astronomy/Catalogs | Astronomy/Definition |
| Astronomy/External Links | Astronomy/Related Articles | Astrophysics |
| Astrophysics/Approval | ||
| Asturian-Leonese language | ||
| Asymmetric key cryptography | Asymmetric key cryptography/Definition | |
| Asynchronous Transfer Mode | Asynchronous Transfer Mode/Definition | |
| Atatürk’s university reforms | ||
| Atatürk’s university reforms/Approval | Ataxia | Ataxia/Approval |
| Ataxia/Definition | Atazanavir | Atazanavir/Approval |
| Atazanavir/Definition | Atbash Cipher | Atbash Cipher/Approval |
| Athabasca Oil Sands | Athabasca Oil Sands/Approval | Athanasios Asimakopulos |
| Athanasios Asimakopulos/Approval | Athanasios Asimakopulos/Definition | Atheism |
| Atheism/Approval | Atheism/Bibliography | Atheism/Definition |
| Atheism/External Links | Atheism/Related Articles | |
| Athens | Athens/Approval | Athens/Definition |
| Atheris | Atheris/Approval | Atheris anisolepis |
| Atheris anisolepis/Approval | ||
| Atheris ceratophora | Atheris ceratophora/Approval | |
| Atheris chlorechis | Atheris chlorechis/Approval | |
| Atheris desaixi | Atheris desaixi/Approval | |
| Atheris hispida | Atheris hispida/Approval | |
| Atheris katangensis | Atheris katangensis/Approval | |
| Atheris nitschei | Atheris nitschei/Approval | |
| Atheris nitschei rungweensis | Atheris nitschei rungweensis/Approval | |
| Atheris squamigera | ||
| Atheris squamigera/Approval | ||
| Atherosclerosis | Atherosclerosis/Approval | |
| Athletics | Athletics/Definition | Athletics/External Links |
| Atkins Nutritional Approach | Atkins Nutritional Approach/Approval | Atkins Nutritional Approach/Definition |
| Atkins Nutritional Approach/Related Articles | ||
| Atlantic Coast Conference | Atlantic Coast Conference/Approval | Atlantic Coast Conference/Definition |
| Atlantic History | Atlantic History/Approval | |
| Atlantic Ocean | Atlantic Ocean/Approval | Atlantic Ocean/Definition |
| Atlas (missile) | Atlas (missile)/Approval | |
| Atmosphere |