Browse the Concise Encyclopedia
- aurochs
- aurora
- auschwitz
- auscultation
- austerlitz, battle of
- austral islands
- australia
- australian aboriginal languages
- australian aborigine
- australian alps
- australian ballet
- australian capital territory
- australian national university
- australian religion
- australian rules football
- australopithecus
- austrasia
- austria-hungary
- austrian netherlands
- austrian school of economics
- austrian succession, war of the
- austro-german alliance
- austroasiatic languages
- austronesian languages
- auteur theory
- autism
- auto sacramental
- autobiography
- autoclave
- autograph
- autoimmune disease
- automata theory
- automation
- automatism
- automaton
- automobile
- automobile racing
- autonomic nervous system
- autopsy
- autumn crocus
- auvergne
- auxiliary
- auxin
- ava
- avalanche
- avalokitesvara
- avalon
- avanti
- avar
- avatamsaka-sutra
- avatar
- avens
- avesta
- avestan language
- aviary
- aviation
- avignon papacy
- avignon school
- avocado
- avocet
- avogadro's law
- avogadro's number
- avoidance behaviour
- avoidance, zone of
- awacs (airborne warning and control system)
- ax
- axiology
- axiom
- axiomatic method
- axis powers
- axle
- axminster carpet
- ayatollah
- aylesbury
- aymara
- ayodhya
- ayrshire
- ayurveda
- ayutthaya
- ayyubid dynasty
- azalea
- azali
- azhar university, al-
- azo dye
- azores
- azov, sea of
- azt
- aztec
- aztec ruins national monument
- azulejo