Browse the Concise Encyclopedia
- amistad mutiny
- amitabha
- ammonia
- ammonoid
- amnesia
- amnesty
- amnesty international (ai)
- amniocentesis
- amoeba
- amon
- amortization
- amos
- amosite
- ampère's law
- amphetamine
- amphibian
- amphibious warfare
- amphibole
- amphibole asbestos
- amphibolite
- amphibolite facies
- amphion and zethus
- amphioxus
- amphipolis
- amphitheater
- amplifier
- amputation
- amritsar, massacre of
- amtrak
- amundsen gulf
- amygdule
- amyotrophic lateral sclerosis (als)
- an lushan rebellion
- anabaena
- anabaptist
- anabolic steroid
- anaconda
- anal canal
- analgesic
- analog computer
- analysis
- analytic geometry
- analytic philosophy
- analytic psychology
- analytic-synthetic distinction
- anamorphosis
- ananda
- anaphylaxis
- anarchism
- anath
- anatolia
- anatolian languages
- anatomy
- anaximenes
- ancestor worship
- ancestral pueblo culture
- anchovy
- ancien régime
- ancient greek civilization
- ancona
- andalusia
- andaman and nicobar islands
- andania mysteries
- andean civilization
- andean geosyncline
- andes mountains
- andesite
- andhra pradesh
- andorra
- andorra la vella
- andreanof islands
- andreini family
- androgen
- andromeda
- andromeda galaxy
- andros
- anemia
- anemometer
- anemone
- anesthesiology
- anesthetic
- aneurysm
- angel
- angel falls
- angelfish
- angevin dynasty
- angina pectoris
- angiocardiography
- angiography
- angioplasty
- angkor
- angkor wat
- angle
- anglerfish
- anglesey, isle of
- anglo-burmese wars
- anglo-dutch wars
- anglo-japanese alliance
- anglo-russian entente