Browse the Concise Encyclopedia
- allotrope
- alloy
- allspice
- alluvial deposit
- almagest
- almanac
- almohad dynasty
- almond
- almoravid dynasty
- aloe
- alpaca
- alpha centauri
- alpha decay
- alphabet
- alpine orogeny
- alpine skiing
- alps
- altai mountains
- altaic languages
- altamira
- altar
- altarpiece
- alte pinakothek
- alternating current (ac)
- alternation of generations
- alternative energy
- alternative medicine
- alternator
- altimeter
- altiplano
- altitude and azimuth
- altitude sickness
- alto
- altria group, inc.
- altruism
- alum
- aluminum
- alzheimer disease
- am
- amalfi
- amalgam
- amanita
- amaranth family
- amaravati sculpture
- amarna, tell el-
- amaryllis family
- amaterasu (omikami)
- amati family
- amazon
- amban
- ambassador
- amber
- ambergris
- amberjack
- ambon
- amelung glass
- amen
- amenemhet i
- amenhotep ii
- amenhotep iii
- amenorrhea
- america's cup
- american airlines
- american anti-slavery society
- american ballet theatre
- american bar association (aba)
- american civil liberties union (aclu)
- american civil war
- american express co.
- american fur co.
- american indian
- american indian languages
- american indian movement (aim)
- american indian religions, north
- american indian religions, south
- american labor party
- american league (al)
- american legion
- american medical association (ama)
- american motors corp. (amc)
- american museum of natural history
- american protective association (apa)
- american renaissance
- american revolution
- american saddlebred
- american samoa
- american stock exchange
- american system
- americium
- amesha spenta
- amethyst
- amhara
- amharic language
- amherst college
- amicus curiae
- amide
- amiens, treaty of
- amine
- amino acid
- amish
