- automatic adjustment
- automatic answer
- automatic break
- automatic choke
- automatic coding
- automatic compiler
- automatic constant
- automatic controller
- automatic drive
- automatic exchange
- automatic following
- automatic computer
- automatic control
- automatic degausser
- automatic lathe
- automatic loading
- automatic lubrication
- automatic programming
- automatic regulator
- automatic retransmitter
- automatic saving
- automatic segmentation
- automatic sequence
- automatic shutdown
- automatic telephone
- automatic telephony
- automatic thermostat
- automatic variable
- automatical computer
- automobile crane
- autonomous
- autorange
- autorestart
- autorized program
- autoscore
- autosynchronized oscillator
- auxanometer
- auxiliary anode
- auxiliary beam
- auxiliary building
- auxiliary cooling
- auxiliary engine
- auxiliary fault
- auxiliary foundation
- auxiliary motor
- auxiliary plant
- auxiliary product
- auxiliary quantity
- auxiliary relay
- auxiliary routine
- auxiliary shaft
- auxiliary station
- auxiliary storage
- auxiliary syncline
- auxiliary terminal
- auxiliary worker
- auxograph
- avail
- available
- available flow
- available memory
- available power
- avalanche
- avalanche diode
- avalanche formation
- avalanche impedance
- avalanche photodevice
- avalanche triggering
- avalanche voltage
- aven
- average
- average bright
- average capacity
- average current
- average density
- average discharge
- average efficiency
- average error
- average grading
- average information
- average load
- average mark
- average power
- average rate
- average speed
- average temperature
- average voltage
- averaged characteristic
- averaging principle
- avert
- avgas
- aviation mix
- aviation snips
- avidity
- avoid
- avoirdupois
- awater height
- axed arch
- axial aberration
- axial blower