audi - back
- audibility
- audible alarm
- audible ringing signal
- audible signaling
- audio
- audio amplifier
- audio control panel
- audio frequency
- audio frequency amplifier
- audio frequency channel
- audio frequency response
- audio frequency telegraphy
- audio frequency transmission
- audio generator
- audio input
- audio monitoring
- audio monitoring device
- audio response
- audio response unit
- audio signal
- audio stage
- audioconference
- audiogram
- audiography
- audiometric earphone
- audit
- audit program
- audit trail
- auditory system
- augend register
- aural
- aural acuity
- aural direction finder
- aural null direction finder
- aural range
- aural reception
- auroral belt
- authentication signal
- author's alterations
- authoring system
