- Above par
- Above the weather
- Above-ground
- Aboveboard
- Abrasion
- Abridge
- Abridgment
- Abrigement
- Abrus
- Abscond with
- Absent-minded
- Absentation from mention
- Absolute majority
- Absolute ruler
- Absolution
- Absolve
- Absorber
- Abstain
- Abstention
- Abstract
- Abstraction
- Absurd drama
- Abusive words
- abuzz
- Acacia
- Academician
- Academics
- Accentuate
- Accessed
- Accidental
- Accidentality
- Acclamatory shouting
- Acclimatization
- Accommodation
- Accompaniments
- Accomplish
- Accomplished
- Accomplishment quotient
- Accordant
- Accorded
- Accordingly
- Accountrements
- Accounts payable
- Accounts receivable
- Accoustics
- Accrete
- Accrued expenses
- Accusatory
- Accuser
- Accusing
- Accusingly
- Ace player
- Acerbic
- Acquisitiveness
- Acquit
- Acrid
- Acridity
- Acrobatic feat
- Act of peace
- Action meter
- Action-packed
- Activate
- Active server pages
- Active service
- Active voice
- Actively
- Activeness
- Activewear
- Actress
- Actual
- Actualise
- 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
- Admire
- Admiring
- Admissibility
- Admission
- Admitted