| a band ... Abakumov, V. S. |
| abalone ... Abdul Rahman, Tuanku |
| Abdul Razak bin Hussein, Tun Haji ... Abipon |
| abiraterone ... absolute refractory period |
| Absolute Spirit ... Abu Salabikh, Tall |
| Abu Sayyaf ... acatalexis |
| Accademia Bridge ... acetyl transacylase |
| acetyl-S-ACP ... Acoemeti |
| Acolhua ... actinium series |
| actinium-227 ... Adad-shum-usur |
| adage ... Adarand Constructors v. Pena |
| Adare, Cape ... adhiyajna |
| Adhruh, arbitration of ... Adolf |
| Adolf Frederick ... advocate |
| advocate general ... Aeronomy of Ice in Mesosphere |
| aerophone ... Afonso III |
| Afonso IV ... Afro-Asiatic languages |
| Afro-Brazilian ... Agee, James |
| Agee, Philip Burnett Franklin ... agon |
| agonism ... Aha Of Shabha |
| Ahab ... Aicard, Jean |
| Aichbuhl ... Air Transport Command |
| air warfare ... Ajyad, Mount |
| Ak Koyunlu ... Akrotiri |
| Akrotiri ... alary muscle |
| Alas, Leopoldo ... Albert IV the Wise |
| Albert l'Ouvrier ... Alcantara Bridge |
| Alcantara, Order of ... Alectura lathami |
| Alegre, Caetano da Costa ... Alexander, John |
| Alexander, Lloyd ... algebraic notation |
| algebraic number ... Alkali Act |
| alkali basalt ... Allegheny Front |
| Allegheny Mountains ... Allin-Springfield rifle |
| Allingham, Margery ... Alnwick Castle |
| Aloadae ... alstonite |
| Alstroemeriaceae ... aluminum brass |
| aluminum bronze ... Amami rabbit |
| Aman-Jean, Edmond-Francois ... Ambika-Mata |
| Ambikapur ... American Ballet, School of |
| American Baptist Association ... American Le Mans Series |
| American League ... Americas, pony of the |
| americium ... ammocoete |
| ammonal ... Amphitheatre Franconi |
| Amphitherium ... An Olympic-Sized Scandal |
| An Qingxu ... Anand, Mulk Raj |
| Anand, Vijay ... ancient lights |
| Ancient Monuments Consolidation and Amendment Act ... Anderton |
| Andes Mountains ... android |
| Andromache ... Angelus family |
| Angelus Silesius ... Angonia highlands |
| Angora goat ... Anini |
| anion ... annuity depreciation |
| annular eclipse ... Antalya |
| Antalya Plain ... anthrax |
| Anthrax anale ... antihypertensive drug |
| antiknock agent ... antitragus |
| antitrust law ... Anziku, Kingdom of |
| Anzilotti, Dionisio ... Api, Gunung |
| Apia ... apostolic church |
| Apostolic Constitutions ... apprenticeship novel |
| appressorium ... Arab Maghrib Union |
| Arab Monetary Fund ... arartree |
| Aras River ... Archaic culture |
| Archaic Greek lyric ... arcuate artery |
| Arcueil ... argentaffin cell |
| Argentan lace ... Ariel |
| Ariel ... Arkoff, Samuel Zachary |
| Arkona ... armour-piercing projectile |
| armour-piercing, fin-stabilized discarding-sabot ... Arnuwandas I |
| Arnuwandas II ... Arsenije III Crnojevic |
| Arsenite schism ... arthrogryposis multiplex congenita |
| Arthroleptidae ... Arung Singkang |
| Arunta Ranges ... Ascension of the Lord, Feast of the |
| Ascential Software ... Ashland |
| ashlar masonry ... asmatika |
| Asmodeus ... Assembly Rooms |
| Assembly, House of ... Asti |
| Asti-Ruwas ... AT-3 Sagger |
| AT-6 Spiral ... Atherton Tableland |
| Atherton, Gertrude ... atmospheric scattering |
| atmospheric science ... Attar, Farid al-Din |
| Attar, Najah al- ... audiometry |
| Audion ... Aurangzeb |
| Auraria ... Australian External Territories |
| Australian Film and Television School ... Autodromo |
| autofocus ... auxiliary hypothesis |
| auxiliary of negation ... Avion III |
| avionics ... axiomatic basis |
| axiomatic method ... azathioprine |
| Azay-le-Rideau ... |
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