| a band ... A380 |
| aa ... Aba Tibetan Autonomous Prefecture |
| abaca ... Abbagnano, Nicola |
| Abbahu ... Abd al-Ghani |
| Abd al-Hafid ... Abdulaziz |
| Abdulhak Hamid ... Aberbach, Julian |
| Abercrombie & Fitch Co. ... Abia |
| Abiathar ... ABO blood group system |
| Abo Elementary School ... abrasion |
| abrasive ... absolution |
| absolutism ... Abu al-Hasan |
| Abu al-Hasan 'Ali ... Abu Nasr al-Malik ar-Rahim |
| Abu Nasr Mansur ... Abukuma-sammyaku |
| Abulafia, Abraham ben Samuel ... Academy of Venice, Galleries of the |
| academy ratio ... acceleration stress |
| accelerator ... Accord, Act of |
| accordion ... acetate flagellate |
| acetazolamide ... Achery, Jean-Luc d' |
| Acheson process ... acid-base reaction |
| acid-base titration ... Aconquija, Sierra del |
| Acontius ... Acre, Plain of |
| acriflavine ... Actaeon |
| Actian Games ... activation foil |
| active crowd ... acute cystitis |
| acute disease ... Adalbert, Adam, Graf von Neipperg |
| Adalbert, Saint ... Adams, Diana |
| Adams, Don ... adaptive agent |
| adaptive control ... additive |
| additive colour film ... adenochrome |
| adenoiditis ... Adiabene |
| adiaphorism ... Adler, Friedrich |
| Adler, Guido ... Adobe Acrobat |
| Adobe Photoshop ... Adrets, Francois de Beaumont, baron des |
| Adria ... advanced mobile phone system |
| Advanced Photon Source ... Aechmea |
| aecium ... Aeolian harp |
| Aeolian mode ... Aeronautical Chart Service |
| aeronautical public correspondence system ... Aethelwulf |
| Aether ... Affleck, Thomas |
| Affolle Anticline ... African black-bellied pangolin |
| African butterfly fish ... African Party for the Independence of Cape Verde |
| African People's Organization ... Afro-Asiatic languages |
| Afro-Brazilian ... Agalliana ensigera |
| Agalychnis calcarifer ... Agavaceae |
| Agave ... Agerod |
| Ageronia ... agitka |
| agitprop ... Agonium |
| Agop ... agricultural policy |
| agricultural sciences, the ... Aguiyi-Ironsi, Johnson T. U. |
| Agul language ... Ahklun Mountains |
| Ahl al-Bayt ... Ahmed III |
| Ahmed Pasa ... aid |
| Aidan ... Ain el-Hanech |
| Ain River ... air pocket |
| air pollution ... Airborne Tactical Data System |
| airbrush ... Aix-la-Chapelle, Congress of |
| Aix-la-Chapelle, Treaty of ... Aka |
| Aka ... Akesson, Birgit |
| akh ... Akkadian literature |
| Akkadian writing ... Akzo NV |
| Al bu Falah ... Alalu |
| Alam al-Halfa, Battle of ... Alaska paper birch |
| Alaska Peninsula ... Albanian League |
| Albanian literature ... Albert I |
| Albert I of Livonia ... Albertini, Luigi |
| Albertinum ... Albret, Jeanne d' |
| Albright's syndrome ... Alchevsk |
| Alchian, Armen A. ... Alcyone |
| Aldabra giant tortoise ... ale |
| ale gallon ... Alert |
| Ales ... Alexander III |
| Alexander III ... Alexandre, Paul |
| Alexandreschate ... Alfama quarter |
| Alfani, Gianni ... algebraic form |
| algebraic function ... alguacile |
| ALH84001 ... Alingar |
| Alinsky, Saul ... alkalophile |
| alkalosis ... All-African Trade Union Federation |
| All-America team ... Allegheny chinquapin |
| Allegheny College ... Allen, Paul G. |
| Allen, Paula Gunn ... Alliance of the Reformed Churches Throughout the World Holding the Presbyterian Order |
| Alliance Party ... allodium |
| AllofMP3 ... Almagro, Diego de |
| almanac ... Alnwick Castle |
| Aloadae ... alpha hindrance factor |
| alpha interferon ... alpine permafrost |
| alpine salamander ... Alte Pinakothek |
| Altenburg ... Altman, Sidney |
| Altmann, Maria ... aluminum chloride |
| aluminum chlorohydrate ... Alvin, Dave |
| Alvintzy, Josef, Baron ... Amalfi |
| amalgam ... Amaranthaceae |
| Amaranthus ... Amazon Cooperation Treaty |
| Amazon Cooperation Treaty Organization ... Ambler, Eric |
| Ambleve, battle of ... Amdang language |
| Ame no minaka-nushi no Kami ... American and Foreign Anti-Slavery Society |
| American Anthropological Association ... American Civil War |
| American cocker spaniel ... American Foundation for AIDS Research |
| anga ... angelology |
| Angelopolis Tigers ... angle of refraction |
| angle of repose ... Anglo-Irish Treaty |
| Anglo-Japanese Alliance ... Anguier, Francois |
| Anguier, Michel ... Anie Peak |
| Anielewicz, Mordecai ... Anini |
| anion ... Anna |
| Anna Comnena ... Anniceris |
| Annie Oakley ... anomalous dispersion |
| anomalous monism ... Anschutz-Kaempfe, H. |
| Anscombe, G E M ... Antananarivo |
| Antandroy ... anterior nasal diphtheria |
| anterior nuclear group ... Anthony, Carmelo |
| Anthony, Earl Roderick ... Anti-Fascist People's Freedom League |
| Anti-Federalists ... anticodon |
| anticoincidence counting ... Antilles Current |
| Antilochus ... Antiochus IV Epiphanes |
| Antiochus Of Ascalon ... antiserum |
| antiship missile ... Antoninus Pius |
| Antoninus, Saint ... anubhava |
| Anubis ... aoidos |
| Aoki, Rocky ... Apapa Quay |
| apapane ... aphidlion |
| aphin ... apocalypticism |
| apocarpous gynoecium ... Apollonius Dyscolus |
| Apollonius of Perga ... apothecary |
| apotheosis ... Appert, Nicolas |
| appetitive behaviour ... applied psychology |
| applied research ... aptitude test |
| aptronym ... Aquifoliaceae |
| Aquifoliales ... arabesque |
| Arabia ... Arafura Shelf |
| Aragani ... Arao |
| Arapaho ... arbitrage |
| arbitration ... Arcado-Cypriot |
| Arcan, Nelly ... Archelaus |
| Archelon ... architecture |
| Architecture and Civil Engineering ... Arctic tundra |
| Arctic Zone ... area method |
| area mining ... Arevaci |
| Arevalo (Bermejo), Juan Jose ... argentite |
| Arges ... Argus Corp. |
| argus fish ... aridity |
| Ariege ... Aristides of Miletus |
| Aristides Quintilianus ... Arjuna |
| Arjunayanas ... Arlington House |
| Arlington National Cemetery ... Armenia |
| Armenia ... armour-piercing projectile |
| armour-piercing, fin-stabilized discarding-sabot ... Arnaud, Georges |
| Arnaud, Henri ... Arnold, Matthew |
| Arnold, Samuel ... Arpad |
| Arpad dynasty ... Arriaga, Camilo |
| Arriaga, Juan Crisostomo ... Arsenius The Great |
| arsenopyrite ... Art Puppet Theatre |
| art quilt ... arterial tree |
| arteriole ... Article IV Consultation |
| Articles of Schwabach ... Artot, Desiree |
| Arts and Crafts Movement ... Arusha Declaration |
| Arusi ... Asad |
| Asad Allah Khan ... Asbury Park |
| Asbury, Francis ... Ascothoracica |
| ascribed status ... Ashby, Michael |
| Ashby-de-la-Zouch ... Ashmore and Cartier Islands |
| Ashmore, Harry Scott ... Asia-Pacific Broadcasting Union |
| Asia-Pacific Economic Cooperation ... Ask Jeeves |
| Askaniya-Nova Nature Reserve ... Aspen |
| aspen ... Assad, Hafiz al- |
| Assad, Muhammad al- ... assessor |
| asset ... associationism |
| Associations, Law of ... Asterix |
| Asterogyne martiana ... Astoria Bridge |
| Astoria Canyon ... Asuncion, La |
| Asuncion, National University of ... Atahuallpa |
| Atajanova, Gurbanbibi ... Aterian industry |
| Ateshkadeh-ye Sorkh Kowtal ... Athens, Academy of |
| Athens, University of ... Atkinson, Theodore Frederick |
| Atkinson, Vanessa ... Atlantic walrus |
| Atlantic, Battle of the ... atomic emission spectroscopy |
| Atomic Energy Act ... Atrax robustus |
| Atrebates ... Attalus III Philometor Euergetes |
| Attalus, Priscus ... attorney, power of |
| Attorney-General's Department ... Aubusson carpet |
| Aubusson, Pierre d' ... Auerbach plexus |
| Auerbach, Berthold ... Augusta, Treaty of |
| augustale ... aura |
| Aura ... Ausfragemethode |
| Ausgleich ... Australian Aboriginal traditional religion |
| Australian Aborigine ... Australian National University |
| Australian Natives Association ... Austro-French Piedmontese War |
| Austro-German Alliance ... Autodromo |
| autofocus ... automatic writing |
| automation ... autotroph |
| autotypist ... Avalon Peninsula |
| Avalon Zone ... average velocity |
| Averescu, Alexandru ... Avions Marcel Dassault-Breguet Aviation |
| avirulence ... Awan dynasty |
| Awangarda Krakowska ... axillary nerve |
| axillary vein ... Ayacucho Basin |
| Ayacucho, Battle of ... Ayr |
| Ayr ... Azcona del Hoyo, Jose Simon |
| Azcona, Rafael ... Azotobacter |
| Azov ... |
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