- A battery
- a few
- a posteriori
- A size
- a test
- a truss
- A-party
- a-supply
- a-twist
- abac
- abacus
- abampere
- abandon
- abandon call
- abandonment
- abat-vent
- abat-voix
- abate
- abatement
- abbreviate
- abbreviated address
- abbreviation
- abdomen
- abduction
- abend
- abide
- ability
- ability test
- ablation
- ablaze
- abnormal
- abnormal combustion
- abnormal function
- abnormal reflection
- aboard
- abohm
- abohm centimeter
- abolish
- abonent
- abort
- abortion mechanism
- abortive subexit
- about
- above
- abrade particle
- abraded glass
- abrading medium
- abrasio
- abrasion plain
- abrasion resistance