| a cappella ... Abbott, Diane |
| Abbott, Edith ... Abenaki |
| Abengourou ... Abrahams, Israel |
| Abrahams, Peter ... acacia |
| Acacian Schism ... Achaemenid Dynasty |
| Achagua ... acrolith |
| acromegaly ... Adams |
| Adams family ... adenovirus |
| Adeodatus II ... Adrets, Francois de Beaumont, baron des |
| Adria ... aeolipile |
| Aeolis ... Afonso IV |
| Afonso V ... Agate Fossil Beds National Monument |
| Agate, James ... Agramonte y Simoni, Aristides |
| agranulocytosis ... Ahmad ibn Tulun, Mosque of |
| Ahmad Khan, Sir Sayyid ... air gun |
| air law ... Akerlof, George A. |
| akermanite ... Alamein, El- |
| Alamgir II ... Albeluvisol |
| Albemarle Sound ... Albuquerque, Afonso de, the Great |
| Albury-Wodonga ... Aleandro, Girolamo |
| Aleardi, Aleardo, Conte ... Alexander VIII |
| Alexander, Dorothy ... Alfven, Hannes |
| algae ... alkali |
| alkali feldspar ... Allgemeine Zeitung |
| Allgood, Sara ... alnico |
| Alnwick ... Altoona |
| Altranstadt, treaties of ... Amarna style |
| Amarna, Tell el- ... amercement |
| America First Committee ... Amery, L.S. |
| Ames ... amniocentesis |
| amnion ... Amu Darya |
| Amud ... Anand, Mulk Raj |
| Ananda ... Andaman Sea |
| Andamanese ... Andreini, Giovambattista |
| Andreini, Isabella ... angelfish |
| angelica ... Angus, Archibald Douglas, 6th Earl of |
| Angus, Archibald Douglas, 8th Earl of, Earl Of Morton ... Anne Arundel |
| Anne Boleyn ... Antares |
| antbird ... Antigonish |
| Antigonus I Monophthalmus ... Antoine, Andre |
| Antoku ... Apalachicola |
| Apamea Cibotus ... aposiopesis |
| apostasy ... Apure River |
| Apurimac ... aragonite |
| Aragua ... Arcadia, Academy of |
| Arcadius ... Ardashir I |
| Ardashir II ... Arguedas, Alcides |
| Arguedas, Jose Maria ... Aritan Stage |
| arithmetic ... Armenian rite |
| Armentieres ... Arnulf of Chocques |
| Arnulf of Metz, Saint ... art and architecture, Mesopotamian |
| art and architecture, Oceanic ... Artigas, Jose Gervasio |
| artillery ... Asbury Park |
| Asbury, Francis ... Ashmolean Museum of Art and Archaeology |
| Ashmore and Cartier Islands ... Assad, Bashar al- |
| Assad, Hafiz al- ... Astor, Brooke Russell |
| Astor, Caroline Webster Schermerhorn ... Athabasca River |
| Athabasca, Lake ... atmosphere |
| atmospheric circulation ... Atwater, Wilbur Olin |
| Atwood, Margaret ... Augustus II |
| Augustus III ... Australian Democratic Labor Party |
| Australian Democrats ... avalanche |
| avalanche effect ... Awaji Island |
| Awali ... azeotrope |
| Azerbaijan ... |
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