- abscission
- absent transfer
- absolute electrometer
- absolute expression
- absolute instrument
- absolute level
- absolute loader
- absolute name
- absolute phase
- absolute viscosity
- absolute volume
- absorb
- absorbed heat
- absorbed power
- absorbent liquid
- absorber
- absorber element
- absorber plate
- absorbing apparatus
- absorbing chamber
- absorbing layer
- absorptance
- absorption basin
- absorption cabinet
- absorption curve
- absorption display
- absorption hygrometer
- absorption medium
- absorption peak
- absorption silencer
- absorption spectrum
- absorption tube
- absorption water
- absorptive attenuator
- absorptive lining
- absorptivity
- abstract algebra
- abstract number
- abstract symbol
- abstructure
- absurd
- abundance
- abundant number
- abunit
- aburton
- abutment stone
- abuttal
- abutting buildings
- abutting edge
- abutting joint