AztecoTanoan languages Bacchus backcross Bacau AZT Bacchylides azimuth Azhar，al Badalona Azerbaidzhan，Republic of Bad Godesberg Babylonian Exile Azana，Manuel Ayub Khan，Mohammad Azores Azov，Sea of Ayrshire cattle Aztecs Azorin Ayutthaya Ayrshire Aymara ayre azalea Baglioni Badoglio，Pietro Azande Azikiwe， Ayers Rock ayeaye Ayesha Ayatollah Ruholla Khomeini axolotl BadenBaden Axum azo dyes Ayer，Sir Alfred Ayckbourn，Alan Axholme，Isle of axis deer axiology Awolowo，Obafemi Aylward，Gladys axiom Avignon school Badajoz avocado Avon，River Avery，Oswald Theodore Avogadro，Amedeo，Conte di Quaregna e Ceretto Bailey，David Avignon papacy Axis Powers average baking powder Avernus，Lake avalanche Aviemore aversion therapy Avignon avocet Auvergne Axminster carpet Baghdad Pact AWACS average autoradiography Avesta Avebury Auxerre Autolycus autism avens Autun autumn crocus autumnal equinox autodafe autogiro autoimmunity automated teller machine autosuggestion auteur theory Austrian Succession，War of the automatic pilot Avon，(Robert) Anthony Eden，1st Earl of Bacteria AustroPrussian War AustroAsiatic languages Avalon Avicenna Australian Rules Austria，Republic of AustriaHungary，Dual Monarchy of Austral Islands Austrasia Austronesian languages Austin，Herbert，1st Baron Australopithecus autopsy Australia，Commonwealth of Australasia Australian Capital Territory Austerlitz，Battle of Austin Auschwitz auricula Bahawalpur Ausgleich auscultation Austin，John Langshaw Aung San auroch austenite Augustine of Hippo，St Austin，John Aurangzeb Aurignacian Augustus Austen，Jane Auric，Georges Auriga Avila Aurora Augusta Australian Antarctic Territory Augusta Augustine of Canterbury，St auditing Augsburg，League of Augsburg Confession Australia Day Aurelian，Lucius Domitius automation Aughrim，Battle of Auden，W(ystan) H(ugh) Augsburg，Peace of Augustinians Auckland，George Eden，Earl of Augustus Ⅰ Augsburg Aubusson Pierre d’ Auckland Islands Aubrey，John audio frequency Auckland Aube，River Audenarde attorney general auction Auch attenuation attar of roses Atwood，Margaret Aubusson Auger effect atropine Auber，Daniel Francois Esprit Audubon，John James atrium aubergine Augustus (Ⅱ) the Strong AttalusⅠSoter augury Aton atomic theory aurora Augereau，Pierre Francois Charles，Duc de Castiglione Attila Atomic Energy Authority atomic energy ATP Attenborough，Richard，Baron Attica atomic force microscope Atropos atomospheric pressure atmosphere atonement Atlantis atomic number atomism atmosphere Atlas Mountains audiovisual education Atlantic City atman atom atomic weight atonality Averroes athlete’s foot atomic mass unit Atlantic Wall Atlas ATM Baffin Island auxin Auchinleck，Sir Claude Atlanta Athelstan