| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| arboretum to Arliss, George |
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| arboretum |
| arborvitae |
| Arbroath |
| Arbuckle Mountains |
| Arbus, Diane |
| Arbuthnot, John |
| arbutus, trailing |
| arc, in electricity |
| arc, in geometry |
| arcade |
| Arcadelt, Jacob |
| Arcadia, region of ancient Greece |
| Arcadia, city, United States |
| Arcadius |
| Arcagnolo |
| Arcaro, Eddie |
| Arcas |
| Arc de Triomphe de l’Étoile |
| Arcesilaus |
| Arch, Joseph |
| arch |
| archaea |
| Archaebacteria |
| archaeology |
| Archaeopteryx |
| Archangel, city, Russia |
| archangel, in religion |
| Archelaus |
| Archeozoic era |
| Archer, William |
| Archer, The |
| archerfish |
| archery |
| Arches National Park |
| archetype |
| Archevites |
| Archi |
| archil |
| Archilochus |
| Archimedes |
| Archimedes’ principle |
| Archimedes’ screw |
| Archipelago |
| Archipenko, Alexander |
| Archipiélago de Colón |
| Archite |
| architecture |
| architrave |
| archons |
| Arcimboldo, Giuseppe |
| Arciniegas, Germán |
| Arcole |
| Arcos de la Frontera |
| Arcot |
| Arctic, the |
| Arctic Archipelago |
| Arctic Circle |
| Arctic North Slope |
| Arctic Ocean |
| Arctic Red River |
| Arcturus |
| Ard |
| Ardashir I |
| Ardashir II |
| Ardebil |
| Ardèche |
| Arden, John |
| Arden, Forest of |
| Ardennes, department, France |
| Ardennes, region, Belgium, Luxembourg, and France |
| Ardennes, Battle of the |
| Ardigò, Roberto |
| Ardmore |
| Ardon |
| area |
| Arecibo |
| Arecibo Observatory |
| Areli |
| Arendal |
| Arendt, Hannah |
| Arensky, Anton Stepanovich |
| Areopagite |
| Areopagus |
| Arequipa |
| Ares |
| Aresson, Jon |
| Aretas |
| Arethusa, in Greek mythology |
| Arethusa, in botany |
| Aretino, Pietro |
| Aretinus, Guido |
| Arezzo |
| Argall, Sir Samuel |
| Argelander, Friedrich Wilhelm August |
| Argenson, Marc Pierre de Voyer de Paulmy, comte d’ |
| Argenson, René Louis de Voyer de Paulmy, marquis d’ |
| Argenteuil |
| Argentina |
| arginine |
| Argirocastro |
| Argo |
| Argob |
| argol |
| Argolis |
| argon |
| argonaut |
| Argonauts |
| Argonne |
| Argonne National Laboratory |
| Argos, city, ancient Greece |
| Argos, in Greek mythology |
| Arguedas, Alcides |
| Arguello, Point |
| Argun |
| Argus |
| Argyll, Archibald Campbell, 1st duke of |
| Argyll, Archibald Campbell, 3d duke of |
| Argyll, Archibald Campbell, 5th earl of |
| Argyll, Archibald Campbell, 8th earl of and 1st marquess of |
| Argyll, Archibald Campbell, 9th earl of |
| Argyll, John Campbell, 2d duke of |
| Argyll |
| Argyllshire |
| Argyrokastron |
| Århus |
| aria |
| Ariadne |
| Ariana |
| Arianespace |
| Arianism |
| Arias, Arnulfo |
| Arias de Ávila, Pedro |
| Arias de Saavedra, Hernando |
| Arias Montanus, Benedictus |
| Arias Sánchez, Oscar |
| Arica |
| Aridai |
| Aridatha |
| Ariège |
| Arieh |
| Ariel, in the Bible |
| Ariel, in astronomy |
| Aries |
| Arikara |
| Arimathaea |
| Ariminum |
| Arioch |
| Arion |
| Ariosto, Ludovico |
| Ariovistus |
| Arisai |
| Arish, Al |
| Arista, Mariano |
| Aristaeus |
| Aristarchus |
| Aristarchus of Samos |
| Aristarchus of Samothrace |
| Aristide, Jean-Bertrand |
| Aristides, Saint |
| Aristides |
| Aristippus |
| Aristobulus |
| aristocracy |
| Aristogiton |
| Aristophanes |
| Aristophanes of Byzantium |
| Aristotle |
| Aristoxenus of Tarentum |
| arithmetic |
| arithmetic progression |
| Arius |
| Arizona |
| Arizona, University of |
| Arizona State University |
| ark |
| Arkansas, indigenous people of North America |
| Arkansas, state, United States |
| Arkansas, river, United States |
| Arkansas, University of |
| Arkansas City |
| Arkansas Post |
| Arkansas State University |
| Arkhangelsk |
| Arkite |
| Arklow |
| Arkwright, Sir Richard |
| Arland, Marcel |
| Arlberg |
| Arlen, Harold |
| Arlen, Michael |
| Arles |
| Arles, kingdom of |
| Arlington, Henry Bennet, 1st earl of |
| Arlington, county, United States |
| Arlington, cities, United States |
| Arlington Heights |
| Arlington House, The Robert E. Lee Memorial |
| Arlington Memorial Bridge |
| Arlington National Cemetery |
| Arliss, George |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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