air - anti
- aluminum-wound rotor
- alumoferrite
- alumoweld conductor
- alumoweld wire
- alundum
- alunite
- alveogram
- alveograph
- alveola
- alveolar disk
- aly
- alychne
- AM
- am
- AM radio
- AM receiver
- AM recording
- AM sideband
- AM-PM conversion
- AM0
- AMA
- Amagat density unit
- Amagat volume unit
- amalgam
- amalgam cell
- amalgam decomposer
- amalgam pot retort
- amalgam trap
- amalgamate
- amalgamated anode
- amalgamating chamber
- amalgamation
- amalgamator
- amateur
- amateur (radio )communication
- amateur (radio )communication
- amateur band
- amateur camera
- amateur cinematographer
- amateur cinematography