| asymptota | asymptote |
| Asymptotyczne tempo wzrostu | Big O notation |
| Asynchronous Transfer Mode | Asynchronous Transfer Mode |
| Asyndeton | Asyndeton |
| Asyria | Assyria |
| Asyrologia | Assyriology |
| Asyryjczycy | Assyrian people |
| Asyryjczyk | Assyrian |
| Asyryjski | Assyrian |
| Asysta | Help |
| asystować | assist |
| Asyż | Assisi |
| Asz-Szarkija | Sharqia Governorate |
| Asz-Szawija-Wardigha | Chaouia-Ouardigha |
| Asz-Szihr | Ash Shihr |
| Aszanti | Ashanti Kingdom |
| Aszchabad | Ashgabat |
| Aszdod | Ashdod |
| Aszera | Asherah |
| Aszkal | Ichkeul Lake |
| Aszkelon | Ashkelon |
| Aszkenazyjczycy | Ashkenazi Jews |
| Aszraf Pahlawi | Ashraf Pahlavi |
| Aszur | Assur |
| Aszura | Day of Ashura |
| Aszurbanipal | Ashurbanipal |
| Aszurdan II | Ashur-dan II |
| Aszurdan III | Ashur-dan III |
| Aszuretiliani | Ashur-etil-ilani |
| Aszurnadinapli | Ashur-nadin-apli |
| Aszurnasirpal II | Ashurnasirpal II |
| Aszurnirari V | Ashur-nirari V |
| Aszuruballit I | Ashur-uballit I |
| Aszuruballit II | Ashur-uballit II |
| Asłan Maschadow | Aslan Maskhadov |
| Asłanczerij Tchakuszynow | Aslan Tkhakushinov |
| At the Drive-In | At the Drive-In |
| At the Gates | At the Gates |
| At the Speed of Life | At the Speed of Life |
| At-Tabari | Muhammad ibn Jarir al-Tabari |
| At-Tamim | Kirkuk Governorate |
| At-Tarariza | Trarza |
| At-Tarik | At-Tariq |
| At-Tauba | At-Tawba |
| At-Tur | El-Tor |
| ATA | AT Attachment |
| Atabaque | Atabaque |
| Atabaskowie | Athapasca |
| Atabeg | Atabeg |
| Atahualpa | Atahualpa |
| atak | attack |
| Atak brute force | Brute-force search |
| Atak man in the middle | Man-in-the-middle attack |
| Atak na Budionnowsk | Budyonnovsk hospital hostage crisis |
| Atak na moskiewski teatr na Dubrowce | Moscow theater hostage crisis |
| Atak na Tarent | Battle of Taranto |
| Atak na tokijskie metro | Sarin gas attack on the Tokyo subway |
| atak serca | heart attack |
| atak słownikowy | dictionary attack |
| Atak terrorystyczny na szkołę w Biesłanie | Beslan school hostage crisis |
| Atak Torre | Torre Attack |
| Atak Trompowskiego | Trompowsky Attack |
| Atak urodzinowy | Birthday attack |
| Atak z wybranym szyfrogramem | Chosen-ciphertext attack |
| Atak z wybranym tekstem jawnym | Chosen-plaintext attack |
| Atak zbrojny na szkołę w Biesłanie | Beslan school hostage crisis |
| Ataka | National Union Attack |
| Atakama | Atacama Desert |
| Atakapa | Atakapa language |
| Atakowaă | Harry |
| atakować | attack |
| Atakpame | Atakpamé |
| Ataksja rdzeniowo-móżdżkowa | Spinocerebellar ataxia |
| Atalanta | Atalanta |
| Atalaryk | Athalaric |
| Atamas | Athamas |
| Atanazy Wielki | Pope Athanasius I of Alexandria |
| Atapuerca | Atapuerca |
| Atari Falcon | Atari Falcon |
| Atari Jaguar | Jaguar |
| Atari Lynx | Lynx |
| Atari Teenage Riot | Atari Teenage Riot |
| Atatürk Olimpiyat Stadyumu | Atatürk Olympic Stadium |
| Ataulf | Ataulf |
| Atauro | Atauro Island |
| atawistyczny | atavistic |
| atawizm | atavism |
| Atbara | Atbarah |
| ATC | ATC |
| Ateas | Ateas |
| Atef Sedki | Atef Sedki |
| ateista | atheist |
| ateistyczny | atheistic |
| ateizm | atheism |
| Ateleopodidae | Jellynose fish |
| Atemi | Atemi |
| Atena | Athena |
| Atena Eudokia | Aelia Eudocia |
| Atenagoras I | Patriarch Athenagoras I of Constantinople |
| Atenagoras z Aten | Athenagoras of Athens |
| Atenas San Carlos | Atenas De San Carlos |
| atencja | deference |
| Atenodoros Kananites | Athenodoros Cananites |
| Atenolol | Atenolol |
| Ateny | Athens |
| Ateqeh Rajabi | Atefah Sahaaleh |
| Aterynokształtne | Atheriniformes |
| atest | certificate |
| Atetoza | Athetosis |
| ATEX | ATEX directive |
| Ateński Związek Morski | Delian League |
| Athabaska | Lake Athabasca |
| Athanasius Kircher | Athanasius Kircher |
| Atharwaweda | Atharvaveda |
| Athelstan | Athelstan of England |
| ATHENA | Athena |
| Athene | Athena |
| Athens | Athens |
| AtheOS FS | AtheOS File System |
| Athina Liwanos | Athina Livanos |
| Athirson | Athirson Mazzoli de Oliveira |
| Athis-Mons | Athis-Mons |
| Athletic Bilbao | Athletic Bilbao |
| Athos | Mount Athos |
| Athos-Aspis | Athos-Aspis |
| Athribis | Athribis |
| Ati | Ati |
| ATI Technologies | ATI Technologies |
| Atia Starsza | Atia Balba Caesonia |
| Atiba Charles | David Atiba Charles |
| Atiku Abubakar | Atiku Abubakar |
| Atimia | Atimia |
| ATIS | Automatic Terminal Information Service |
| Atisa | Atisha |
| Atitlán | Volcán Atitlán |
| Atiu | Atiu |
| atlant | atlantes |
| Atlanta | Atlanta |
| Atlanta Braves | Atlanta Braves |
| Atlanta Buenos Aires | Club Atlético Atlanta |
| Atlanta Falcons | Atlanta Falcons |
| Atlanta Hawks | Atlanta Hawks |
| Atlanta Thrashers | Atlanta Thrashers |
| Atlante Cancún | Atlante Fútbol Club |
| Atlantic | Atlantic |
| Atlantis | Space Shuttle Atlantis |
| Atlantis szczęśliwie poleciał w kosmos | Successful launch of Space Shuttle Atlantis |
| atlantycki | Atlantic |
| Atlantyda | Atlantis |
| Atlantyk | Atlantic |
| atlas | atlas |
| Atlas geograficzny | Atlas |
| Atlas Guadalajara | Fútbol Club Atlas |
| Atlas nieba | Star cartography |
| Atlas Oryx | Atlas Oryx |
| Atlas Saharyjski | Saharan Atlas |
| Atlas V | Atlas V rocket |
| Atlas Wysoki | High Atlas |
| Atlatl | Atlatl |
| Atletico Bello Sabaneta | Atlético Bello |
| Atletico Bucaramanga | Atlético Bucaramanga |
| Atletico Huila Neiva | CD Atlético Huila |
| Atletyka | Athletics |
| Atli Dam | Atli Dam |
| Atlántico | Atlántico Department |
| Atlético Goianiense Goiânia | Atlético Clube Goianiense |
| Atlético Junior Barranquilla | Atlético Junior |
| Atlético Madryt | Atlético Madrid |
| Atlético Marte San Salvador | Atlético Marte |
| Atlético Mineiro Belo Horizonte | Clube Atlético Mineiro |
| Atlético Nacional Medellín | Atlético Nacional |
| Atlético Paranaense | Clube Atlético Paranaense |
| Atlético Rafaela | Atlético de Rafaela |
| Atlético Rio Branco | Atlético Acreano |
| Atlético Tucumán | Club Atlético Tucumán |
| ATM | ATM |
| ATM Adaptation Layers | ATM Adaptation Layers |
| Atmel AVR | Atmel AVR |
| atmosfera | ambience |
| Atmosfera baroklinowa | Baroclinity |
| Atmosfera duchowa | Atmosphere |
| Atmosfera fizyczna | Atmosphere |
| Atmosfera Marsa | Atmosphere of Mars |
| Atmosfera słoneczna | Stellar atmosphere |
| Atmosfera wzorcowa | International Standard Atmosphere |
| Atmosferyczna Brązowa Chmura | Asian brown cloud |
| atmosferyczny | atmospheric |
| Atmosferyczny silnik parowy | Newcomen steam engine |
| Atmosphera | Atmosphere |
| atol | atoll |
| Atol Bikini | Bikini |
| Atol Bokak | Bokak Atoll |
| Atol Eniwetok | Enewetak |
| Atol Kili | Kili Island |
| atom | atom |
| Atom Egoyan | Atom Egoyan |
| Atom Willard | Adam Willard |
| Atomic | Atomic Skis |
| Atomic Kitten | Atomic Kitten |
| atomista | atomist |
| Atomium | Atomium |
| Atomowa Betty | Atomic Betty |
| atomowy | atomic |
| Atomy rydbergowskie | Rydberg atom |
| Atomówki | The Powerpuff Girls |
| Aton | Aten |
| Atopia | Atopy |
| Atorwastatyna | Atorvastatin |
| Atos | Athos |
| Atossa | Atossa |
| Atowakwon | Atovaquone |
| ATP | ATP |
| ATP Masters Series | ATP Masters Series |
| ATRAC | Adaptive Transform Acoustic Coding |
| atrakcja | attraction |
| atrakcyjność | attractiveness |
| Atrakcyjność fizyczna | Sexual attraction |
