- Astray
- At all costs
- At all times
- At close quarters
- At dawn
- At full pelt
- At full strain
- At hand
- At knife point
- At length
- At one time
- At ones risk
- At ones sweet soil
- At peak
- At play
- At sea
- At sixes and sevens
- At stake
- At the eleventh hour
- At the longest
- At the same time
- At the top of ones voice
- Atone
- Atonement
- Atrocious
- Atrocities
- Atrorcious
- Attaching
- Attachment
- Attachments
- Attacker
- Attain
- Attempt the impossible
- Auctioneer
- Audibility
- Audibleness
- Audibly
- Audit
- Audition
- Auditor
- Aught
- Augmented reality
- August-september
- Augustly
- Aunt
- Aureate
- Aurora
- Auster
- Austere
- Auteur
- Authenticate
- Authentication
- Authorised
- Authoritarianism
- Authoritative
- Autopsy
- Autotype
- Autumn
- Avacado
- Avarise
- Aver
- Average
- Avid
- Avidly
- Aviform
- Axle-tree
- Azolla
- Azure
- Altaltissimo
- Ark
- Astron
- Ataxia, ataxia
- A dirty trick
- A divine bird born of aruna and syeni
- A dog's death
- A figure of speech in which an indirect theme adduces to the direct
- A flower tree
- A forestation
- A founding father
- A fractuary
- A friend in need is a friend indeed
- A gamogenesis
- A good number of
- A good or great while
- A good second
- A good sort
- A hard life
- A herb
- A herb conceived as being capable of bringing the dead to life
- A large number
- A late hour
- A long face
- A standing joke
- A suicide pact
- A tall story
- A touch of the tar brush
- A walking encyclopaedia
- A warrior who drives the chariot and fights at the same time
- A.d
- Aaai