Browse the Concise Encyclopedia
- antitrust law
- antlion
- antofagasta
- antonine wall
- antrim
- antyesti
- anu
- anubis
- anuradhapura
- anvil
- anxiety
- anzio
- anzus pact
- aorta
- aorta, coarctation of the
- apache
- apartheid
- apatite
- apatosaurus
- ape
- apec
- apella
- apelles
- apennines
- apgar score system
- aphasia
- aphid
- aphorism
- aphrodisiac
- aphrodite
- apia
- apis
- aplastic anemia
- aplite
- apo, mt.
- apocalypse
- apocrypha
- apollo
- apollo theatre
- apollonius dyscolos
- apologetics
- apologist
- apology
- apomixis
- apoptosis
- apostle
- apostolic succession
- apotheosis
- apotropaic eye
- appalachian geosyncline
- appalachian mountains
- appalachian orogenic belt
- appaloosa
- appanage
- appeal
- appeasement
- appendix
- appian way
- apple
- apple inc.
- apple scab
- applied psychology
- appomattox court house
- apprenticeship
- apra
- apraxia
- apricot
- april fools' day
- april theses
- apse
- aqaba, gulf of
- aqhat epic
- aquaculture
- aquamarine
- aquarium
- aquarius
- aquatint
- aquavit
- aqueduct
- aquifer
- aquitaine
- ara pacis (augustae)
- arab
- arab league
- arab-israeli wars
- arabesque
- arabian desert
- arabian horse
- arabian peninsula
- arabian religions, ancient
- arabian sea
- arabic alphabet
- arabic language
- arabic literary renaissance
- arabic philosophy
- arachne
- arachnid
- arachosia
- aragon
- aragonite