- Armlet
- Armoured
- As and when
- Arrogant
- Arrogate
- Arrow
- Arrow and bow
- Arrow point
- Arrow-root flower
- Arrow-root powder
- Arrow-root-flour
- Art director
- Arthropod
- As clear as mud
- As far as possible
- As fit as a fiddle
- As if
- As memory serves
- As much again
- As old as methuselah
- Ascendent
- Asceticism
- Asecrtained
- Asexuality
- Ash-colour
- Ashore
- Ashy
- Asian palm civet
- Aside
- Ask for
- Assembler
- Assert
- Assesed lands
- Assess
- Assessee
- Asset
- Assignor
- Assimilated
- Assistance
- Assize
- Associate
- Associated
- Astrodome
- Astrolobe
- Astrologer
- Astute
- Astuteness
- Aswathi star
- Aswini devas
- At a gun point
- 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
- Authorized person
- Autistic
- Auto index
- Auto-ignition
- Autobiography
- Autodidact
- Automation
- Autonomy
- Avionics
- Awake
- Awe
- Awe-inspiring
- Awestruck
- Awhile
- Awkwardly
- Awn