- autosave
- autosuggestion
- autotimer
- autowinder
- autumn
- autumnal
- auxiliary
- auxiliary verb
- av.
- Av.
- AV
- avail
- availability
- available
- available market
- avalanche
- avant-garde
- avarice
- avaricious
- avatar
- Ave.
- Ave Maria
- avenge
- avenger
- avenging
- Aventine Hill
- avenue
- aver
- average
- average propensity to consume
- average propensity to save
- averse
- aversion
- aversion therapy
- avert
- avian influenza
- aviary
- aviation
- aviator
- aviculture
- avid
- avidity
- avidly
- avigation
- avionics
- avocado
- avocation
- avocet
- avoid
- avoidable
- avoidance
- avoirdupois
- avow
- avowal
- avowed
- avowedly
- avuncular
- aw
- await
- awake
- awaken
- awakening
- award
- award-winner
- award-winning
- aware
- awareness
- awash
- away
- awayday
- awe
- awed
- awe-inspiring
- awesome
- awe-struck
- awful
- awfully
- awfulness
- awhile
- awkward
- awkwardly
- awkwardness
- awl
- awning
- AWOL
- awry
- axe
- axel
- axeman
- axial
- axil
- axiom
- axiomatic
- axis
- axle
- axle-box
- axle-pin
- axletree
- ay
- ayatollah
- aye
- aye-aye
- AZ
- azalea
- Azerbaijan
- Azerbaijani
- Azeri
- azimuth
- azonal soil
- Azores
- AZT
- Aztec
- azure
- azurite