- acre; acres.
- variant of ad- before c and qu: accede; acquire.
- variant of -ic after Greek noun stems ending in i:cardiac; maniac.
- (in prescriptions) before meals.
- before Christ.
- Army Corps.
- Athletic Club.
- Ascension Island
- actinium
- alternating current
- ante Christum
- Air Corps
- athletic club
- Companion of the Order of Australia
- appellation d'origine contrôlée: the highest French wine classification; indicates that the wine meets strict requirements concerning area of production, strength, etc
- Aelodau'r Cynulliad: Member of the Assembly (that is, the National Assembly of Wales)
- (in prescriptions) ante cibum
- account
- account current
- Air Commodore