| a band ... Aba Novak, Vilmos |
| Aba Tibetan Autonomous Prefecture ... ABC |
| Abd al-Aziz ... Abenteuerroman |
| Abeokuta ... Abner |
| Abney, Sir William de Wiveleslie ... Absolute Spirit |
| absolute temperature scale ... Abu Mansur ibn Yusuf |
| Abu Muhammad al-Baghawi ... Academy |
| academy ... acclimatization |
| accommodation ... Achebe, Chinua |
| Acheiropoietos, Church of the ... acolyte |
| Acoma ... acrylic painting |
| acrylonitrile ... actual sin |
| actuality ... Adamov, Arthur |
| Adams ... Addison |
| Addison disease ... adhyasa |
| adhyatmavidya ... admiralty brass |
| Admiralty Inlet ... adult education |
| adult stem cell ... Aegyptopithecus |
| Aegyptus ... aesthetic distance |
| aesthetic experience ... Afram River |
| afrancesado ... African vine snake |
| African violet ... Agasias |
| Agassi, Andre ... Aggtelek Caves |
| Agha Mohammad Khan ... Agrelo, Marilyn |
| agreste ... Ahalya Bai |
| Ahanda, Joseph ... Ahrens, Wilhelm Ernst Martin Georg |
| Ahriman ... air cooling |
| air curing ... Airship Industries |
| airside facility ... akasha |
| Akasha ... Aksakov, Sergey Timofeyevich |
| Akselrod, Pavel Borisovich ... Aland Islands |
| Aland, Congress of ... Albarn, Damon |
| Albarno, Montreal d' ... albinism |
| Albino ... Alcmene |
| Alcoa ... Aleixandre, Vicente |
| Alekan, Henri ... Alexander romance |
| Alexander the Great ... Alfonso I |
| Alfonso II ... Ali Haji bin Raja Amhad, Raja |
| Ali Kosh ... alkoxy-silane |
| alkyd ... allegorical portraiture |
| allegory ... Allied Powers |
| Allied Powers ... Almaty |
| Almeida de Portugal, Leonor de ... Alpha Suffrage Club |
| alpha wave ... alternate binaural loudness balance test |
| alternate leaf arrangement ... aluminum hydroxide |
| aluminum intensive vehicle ... Amalgamated Engineering and Electrical Union |
| Amalgamated Engineering Union ... Amazon red squirrel |
| Amazon River ... Ameche, Don |
| Ameghino, Florentino ... American cockroach |
| American College ... American Mathematical Society |
| American Medical Association ... American witch hazel |
| American Woman Suffrage Association ... aminoacyl-acceptor site |
| aminoacyl-AMP complex ... Amon-Re |
| Amontons, Guillaume ... AMR |
| Amr Bey, F. D. ... Anabantidae |
| Anabaptist ... Analytical Engine |
| analytical jurisprudence ... Anaya, Jorge Isaac |
| Anaya, Rudolfo A. ... Andersen, Lisa |
| Andersen, Morten ... Andrade, Jorge |
| Andrade, Mario de ... Andronicus Of Rhodes |
| Andronovo culture ... Angell, James Burrill |
| Angell, James Rowland ... Anglo-Ethiopian Treaty |
| Anglo-French Treaty ... Anhwei School |
| anhydride ... Ankermann, Bernhard |
| ankh ... Annunciation, Grotto of the |
| anoa ... Anta |
| anta ... anthocyanin |
| anthodite ... antiblue |
| antibody ... antinomy |
| Antinoopolis ... antlion |
| Antofagasta ... Anyte |
| Anytus ... aperitif |
| aperture ... Apollo group |
| Apollo program ... appeal |
| Appeal, Court of ... April |
| April Fools' Day ... Arab Deterrent Force |
| Arab Economic Unity, Council of ... Arakcheyev, Aleksey Andreyevich, Graf |
| Araki Sadao ... Arbuckle, Roscoe |
| Arbujad ... Archias, Aulus Licinius |
| archicerebellum ... Ardea |
| Ardea ... Argaric Culture |
| Argead Dynasty ... Arhuaco |
| Arhus ... Aristotelianism |
| Aristotle ... Armagh |
| Armagh, Book of ... arms race |
| Arms, Assize of ... Arnulf |
| Arnulf ... arrow of time |
| Arrow War ... Artabanus III |
| Artabanus IV ... artificial biology |
| artificial corundum ... Aryadeva |
| Aryan ... ascending aorta |
| ascending colon ... Asher |
| Asher ben Jehiel ... Asian flu |
| Asian Football Confederation ... aspergillic acid |
| aspergillosis ... assignat |
| assigned counsel ... Asterozoa |
| asthenia ... Asvalayana |
| asvamedha ... Athabasca Glacier |
| Athabasca River ... Atlanta |
| Atlanta Ballet ... Atomic Energy Commission |
| Atomic Energy Commission ... Attalus, Priscus |
| attan ... Aubusson carpet |
| Aubusson, Pierre d' ... Augusta Victoria |
| Augusta, Treaty of ... Ausdruckstanz |
| Auseklis ... Australian Museum |
| Australian National Kennel Council ... autochthon |
| autoclave ... autosuggestion |
| autotelism ... average |
| average ... AWACS |
| Awadesh Pratap Singh University ... axopodium |
| Axton, Estelle Stewart ... Azariqah |
| Azarov, Mykola ... |
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