- A stroke of fate
- A thing or two
- A think tank
- A thorny question
- A tree which has shed its leaves
- A tune
- A type of plantain
- A water grass with umbrella-like foliage
- Aasvogel
- Absentation from mention
- Absolute majority
- Absolute ruler
- Absolution
- Absolve
- Absorber
- Abstain
- Abstention
- Abstract
- Accentuate
- Accessed
- Accidental
- Accidentality
- Acclamatory shouting
- Acclimatization
- Accommodation
- Accrete
- Accrued expenses
- Accusatory
- Accuser
- Accusing
- Accusingly
- Ace player
- Acerbic
- Acquisitiveness
- Acquit
- Acrid
- Acridity
- Acrobatic feat
- Actually
- Acumen
- Acute pain
- Ad-lib
- Adagio
- Adams apple
- Adapt to
- Adaptableness
- Adaptation
- Adc
- Adhere
- Adhering
- Adjacent
- Adjoin
- Adjudge
- Adjudication
- Adjudicator
- Adjunct
- Adman
- Administer
- Administrating
- Administration
- Administrative
- Administrative system
- Adorer
- Adorning
- Adroitly
- Adulteress
- Adumbrate
- Adumbration
- Affulment
- Aerial combat
- Aerial root
- Aeriform
- Aerobatic
- Aerodynamics
- Aerogramme
- Aeronaut
- Aeronautics
- Aeroplane
- Aesthetic
- Aesthetics
- Afar
- Affable
- Affecting
- Aflame
- African
- After hours
- Aftercare
- Afterlife
- Aggressiveness
- Agitated
- Agitated person
- Agitation
- Agnomen
- Agnostic
- Agnosticism
- Agonize
- Agony
- Agoraphobia
- Agree on
- Agreeable