| A Call to Compassion ... Abakan River |
| Abakanowicz, Magdalena ... Abd al-Ghani al-Nabulusi |
| Abd al-Hafid ... Abe Masahiro |
| Abe Shinzo ... abhibhvayatana |
| Abhidhamma Pitaka ... Abraham Lincoln: The War Years |
| Abraham, Karl ... Abu 'Ali Mustafa |
| Abu al-'Abbas as-Saffah ... Academy of Venice, Galleries of the |
| Academy, Gallery of the ... Accursius, Franciscus |
| accused, rights of ... Achinsk |
| Acholi ... acre |
| Acre River ... Actors Studio, The |
| Acts of the Apostles, The ... Adams, Brooks |
| Adams, Charles Follen ... Addison (of Stallingborough), Christopher Addison, 1st Viscount, Baron Addison Of Stallingborough |
| Addison disease ... Adil Shahi dynasty |
| Adilabad ... Adolphe |
| Adonais ... advanced persistent threat |
| advanced structural ceramics ... Aelfheah, Saint |
| Aelfric ... aesthetics |
| Aeterni Patris ... Afghanistan: Year in Review 2004 |
| Afghanistan: Year in Review 2005 ... African pouched rat |
| African Queen, The ... agape |
| Agapetus I, Saint ... agglutinate |
| agglutination ... Agramonte y Simoni, Aristides |
| agranulocytosis ... Aguascalientes |
| Aguascalientes ... Ahmad Shah |
| Ahmad Shah Durrani ... Aiken |
| Aiken, Conrad ... air-traffic control |
| airbrush ... Akal Takht |
| Akali ... Akrotiri |
| Aksai Chin ... Alagoinhas |
| Alain ... alb |
| Alba ... Albany, Louise Maximilienne Caroline, Countess of |
| Albany, Robert Stewart, 1st duke of ... Albertina Graphics Collection |
| Albertine ... Alcala Zamora, Niceto |
| Alcala, Calle de ... Aldabra Islands |
| Aldan River ... Alemanni |
| Alembert, Jean Le Rond d' ... Alexander Island |
| Alexander IV ... Alexis, Saint |
| Alexis, Willibald ... algebraic geometry |
| algebraic number ... Ali |
| Ali ar-Rida ... alkali flat |
| alkali metal ... allemande |
| allemontite ... Alliluyeva, Svetlana |
| Allingham, Margery ... Almendros, Nestor |
| Almeria ... alpwirtschaft |
| Als ... Altona |
| Altoona ... Amakusa Islands |
| Amalaric ... Amazon |
| Amazon Cooperation Treaty Organization ... ambush bug |
| Amda Tseyon ... American Evangelical Lutheran Church |
| American Express Company ... Americanism |
| Americanization ... Amin, Hafizullah |
| Amin, Idi ... amora |
| Amorgos Island ... Amram bar Sheshna |
| Amratian culture ... Anacletus (II) |
| Anacletus, Saint ... Ananda Mahidol |
| Ananke ... Anchises |
| anchor ... Anderson, Gillian |
| Anderson, Helen Eugenie Moore ... Andorra: Year in Review 2007 |
| Andorra: Year in Review 2008 ... Andrewes, Lancelot |
| Andrews Sisters, the ... anekantavada |
| anemia ... angina pectoris |
| angiocardiography ... Angola: Year in Review 1998 |
| Angola: Year in Review 1999 ... Aniakchak National Monument and Preserve |
| anicca ... Ankylosaurus |
| Ann Arbor ... Annunciation |
| anode ... Antall, Jozsef |
| Antalya ... Anthimus of Iberia |
| Anthimus VI ... anthropometry |
| anthropomorphism ... Antigua and Barbuda: Year in Review 1998 |
| Antigua and Barbuda: Year in Review 1999 ... Antiochus II Theos |
| Antiochus III ... Antonio, Mario |
| Antonio, Nicolas ... Aoba |
| AOL ... Aphanomyces |
| aphasia ... Apology of the Augsburg Confession |
| apomixis ... Appiah, Kwame Anthony |
| Appian of Alexandria ... aqil |
| Aqqad, 'Abbas Mahmud al- ... Arabia |
| Arabia ... Aramis |
| Aran Islands ... Arbuckle orogeny |
| Arbuckle, Roscoe ... Archer, Isabel |
| Archer, Lew ... Architecture and Civil Engineering: Year in Review 2011 |
| Architecture and Civil Engineering: Year in Review 2012 ... Ardashir I |
| Ardashir II ... Argead Dynasty |
| Argelander, Friedrich Wilhelm August ... Arguello, Alexis |
| Arguin Island ... Ariosto, Ludovico |
| Arisaema ... Arkansas River |
| Arkansas River Navigation System ... Armenia: Year in Review 1995 |
| Armenia: Year in Review 1996 ... armoured mud ball |
| armoured vehicle ... Arnold, Henry Harley |
| Arnold, Jack ... arrhythmia |
| Arriaga, Juan Crisostomo ... Art and Art Exhibitions: Year in Review 2009 |
| Art and Art Exhibitions: Year in Review 2010 ... Artemisa |
| artemisia ... artillery |
| Artin, Emil ... Arzew |
| Arzner, Dorothy ... Asclepigenia |
| Asclepius ... Ashikaga Yoshiaki |
| Ashikaga Yoshimasa ... Asiatic black bear |
| Asiatic Society of Bengal ... Aspiring, Mount |
| Aspleniaceae ... association croquet |
| Association for Computing Machinery ... Astor, Mary |
| Astor, Nancy Witcher Astor, Viscountess ... Atacama Large Millimeter Array |
| Atacama Plateau ... Athenagoras |
| Athenagoras I ... Atlantic Intracoastal Waterway |
| Atlantic languages ... atonement |
| Atoni ... Atto Adalbert |
| attorney general ... Auer, Leopold |
| Auerbach, Berthold ... Aung San Suu Kyi |
| Aunis ... Austin, Louis Winslow |
| Austin, Mary ... Australian Patriotic Association |
| Australian region ... auto-da-fe |
| autoantibody ... automotive ceramics |
| automotive industry ... aversion therapy |
| Avery, Byllye ... Awali |
| Awan ... Ayllon, Lucas Vazquez de |
| Aylmer, John ... Azerbaijan: Year in Review 2001 |
| Azerbaijan: Year in Review 2002 ... |
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