- airplane pilot
- airplane propeller
- airplane ticket
- airport
- airport terminal
- airpost
- air-raid shelter
- airs
- airscrew
- airship
- air-ship
- airsick
- airsickness
- air-slake
- air-sleeve
- airspace
- airspeed
- airstream
- airstrip
- airt
- airtight
- air-tight
- air-to-air
- air-to-air missile
- air-to-ground
- air-to-ground missile
- air-to-surface
- air-to-surface missile
- airwave
- airway
- airwoman
- airworthiness
- airworthy
- airy
- aisle
- aitchbone
- aix
- aix galericulata
- aix sponsa
- aix-la-chapelle
- aizoaceae
- ajaia
- ajaia ajaja
- ajar
- ajax
- ajuga
- ajuga chamaepitys
- ajuga genevensis
- ajuga pyramidalis
- ajuga reptans
- ak
- akaba
- akan
- akaryocyte
- akaryote
- akee
- akee tree
- aken
- akeridae
- akha
- akhbari
- akhenaten
- akhenaton
- akimbo
- akin
- akinesia
- akinesis
- akinetic epilepsy
- akira kurosawa
- akka
- akkadian
- akko
- akmola
- akron
- aksa martyrs brigades
- aku
- akvavit
- akwa'ala
- al
- al alamayn
- al aqabah
- al capone
- al dente
- al faran
- al gore
- al hirschfeld
- al itihaad al islamiya
- al jolson
- al ladhiqiyah
- al madinah
- al nathir
- al qahira
- al qanoon
- al sunna wal jamma
- al tawhid
- ala
- alabama
- alabama lip fern
- alabama river
- alabaman
- alabamian
- alabaster
- alabastrine
- alacritous
- alacrity
- aladdin
- aladdin's lamp
- al-aksa martyrs brigades
- alalia
- alamo
- alan alexander milne
- alan bartlett shepard jr.
- alan hodgkin
- alan jay lerner
- alan lloyd hodgkin
- alan mathison turing
- alan paton
- alan seeger
- alan shepard
- alan stewart paton
- alan turing
- aland islands
- alanine
- alar
- alaric
- alarm
- alarm bell
- alarm clock
- alarm system
- alarmed
- alarming
- alarmingly
- alarmism
- alarmist
- alarum
- alary
- alas
- al-asifa
- alaska
- alaska cedar
- alaska cod
- alaska crab
- alaska fur seal
- alaska king crab
- alaska native
- alaska peninsula
- alaska range
- alaska rein orchid
- alaska standard time
- alaskan
- alaskan brown bear
- alaskan king crab
- alaskan malamute
- alaskan native
- alaskan pipeline
- alastrim
- alate
- alated
- alauda
- alauda arvensis
- alaudidae
- alb
- albacore
- alban berg
- albania
- albanian
- albanian capital
- albanian monetary unit
- albany
- albatrellus
- albatrellus dispansus
- albatrellus ovinus
- albatross
- albedo
- albee
- alben barkley
- alben william barkley
- albers
- albers-schonberg disease
- albert
- albert abraham michelson
- albert bruce sabin
- albert camus
- albert edward
- albert einstein
- albert francis charles augustus emmanuel
- albert gore jr.
- albert michelson
- albert sabin
- albert schweitzer
- albert speer
- albert szent-gyorgyi
- albert von szent-gyorgyi
- alberta
- alberti
- alberto giacometti
- albescent
- albigenses
- albigensian
- albigensianism