- auto-covariance
- auto-increment
- auto-link
- auto-loading
- auto-plotter
- auto-polarity
- auto-prompting
- auto-repeat
- auto-restart
- auto-select
- auto-summarize
- auto-task
- autobiography
- autocorrelation coefficient
- autocovariance
- autoload
- autoloader
- automata theory
- automated graphics
- automatic abstracting
- automatic answer
- automatic answering
- automatic backup
- automatic bind
- automatic calculation
- automatic classification
- automatic code
- automatic coding
- automatic controller
- automatic diagnosis
- automatic dialer
- automatic dictionary
- automatic drive
- automatic exchange
- automatic formatting
- automatic connection
- automatic conversion
- automatic creation
- automatic deactivation
- automatic dial
- automatic function
- automatic numbering
- automatic programming
- automatic routine
- automatic servo
- automatic shutdown
- automatic summary
- automatic tuning
- automatic variable
- automorphic
- automount
- autonomous
- autonomous working
- autoprojectivity
- autoregressive
- autostart job
- auxiliary anode
- auxiliary carry
- auxiliary console
- auxiliary descriptor
- auxiliary equation
- auxiliary file
- auxiliary flag
- auxiliary integral
- auxiliary part
- auxiliary stacker
- auxiliary storage
- auxiliary view
- availability bit
- available
- available choice
- available power
- available state
- available time
- avalanche
- avalanche diode
- avalanche impedance
- avatar
- average capacity
- average density
- average divergence
- average load
- average rate
- averaging circuit
- axial homology
- axiomatization
- axle bearing
- axoid
- automatic transmitter
- automatic turning
- automatic typewriter
- automorphism group
- Autoregression
- autoregressive series
- autostart
- auxiliary condition
- auxiliary operation
- auxiliary statistic
- availability
- available accuracy