- autognition temperature
- autoincremental addressing
- autoindex
- autologon
- automate
- automated
- automatic adjuster
- automatic bias
- automatic brake
- automatic calculator
- automatic calling
- automatic carriage
- automatic check
- automatic checking
- automatic clutch
- audibility factor
- audible
- audible cue
- audible frequency
- audible signal
- audible tone
- audience microphone
- audio
- audio book
- audio disk
- audio dubbing
- audio frequency
- audio indicator
- audio mixer
- audio mixing
- audio oscillator
- audio transformer
- audio-visual
- audiofrequency meter
- audiofrequency oscillator
- audiogram
- audion
- audiophone
- audit
- audit history
- audit trail
- auditing
- auditorium hall
- auditory
- auditory sensation
- augend
- augend digit
- auger bit
- auger borer
- auget
- augmenter
- aural carrier
- aural detection
- aural presentation
- aural reception
- aural transmitter
- aural warning
- auric
- auriferous sand
- aurora-australis
- authentication
- authenticity
- authorization code
- authorized abbreviation
- authorized frequency
- authorized program
- authorizer
- auto bike
- auto key
- auto relay
- auto tracking
- auto-answer
- auto-caller
- auto-cycle
- auto-disconnect
- auto-loading
- auto-repeat
- auto-restart
- autoclave
- autoclave curing
- autoclave molding
- autocode
- autocollimation
- autocorrelation function
- autodecremental addressing
- autodump
- autodyne oscillator
- autodyne reception
- autoelectronic emission
- autoexcitation
- autogenetic drainage
- autogenous healing
- autognition
- autograph
- autoinductive coupling
- autoload
- autoloader
- automata
- automata theory
- automated plant