- acetate film
- acetate laminate
- acetic
- acetous
- acetylation
- acetylene burner
- acetylene excess
- acetylene gas
- acetylene generator
- acetylene pressure
- acetylene torch
- A4-size
- abaci
- aback
- abaft
- aballenation
- abandoned beach
- abat-jour
- abaxial
- abbarthrosis
- Abbe coefficient
- abbey
- abbreviated designation
- abbreviated number
- abeam
- aberration
- abietic acid
- ablative method
- ablative shield
- ablution trough
- abnormal end
- abnormal propagation
- abnormal refraction
- abnormal status
- abnormal temperature
- abnormal termination
- about-sledge
- abradant
- abrade
- abrading
- abrasion surface
- abrasive cleaner
- abrasive paper
- abrasive rock
- abrasive wheel
- abrasivity
- abrupt slope
- abruption
- abscess
- abscissa