- abutting surface
- abyssal deposit
- abyssal fracture
- abyssal rock
- ac
- AC generator
- AC market
- AC motor
- accelerated composting
- accelerated lane
- abrase
- abrasion
- abrasion tester
- abrasive
- abrasive cloth
- abrasive disk
- abrasive material
- abrasive power
- abrasive water
- abrasiveness
- abrupt bank
- absence undercutting
- absent service
- absobed energy
- absolute accuracy
- absolute altimeter
- absolute deflection
- absolute density
- absolute element
- absolute error
- absolute galvanometer
- absolute limit
- absolute move
- absolute ohm
- absolute permeability
- absolute position
- absolute valence
- absolute vector
- absolutely continuous
- absolutely convex
- absorbed dose
- absorbed water
- absorbency value
- absorbent charge
- absorber charge
- absorbing
- absorbing medium
- absorbing temperature
- absorptiometry
- absorption bottle