- backwash water
- backwater
- backwater curve
- backwater effect
- backwater jump
- automatic ignition
- automatic interrupter
- automatic line
- automatic loader
- automatic lock
- automatic logon
- automatic machine
- automatic monitoring
- automatic point
- automatic processing
- automatic proof
- automatic reading
- automatic redundancy
- automatic regulation
- automatic relay
- automatic restart
- automatic ringing
- automatic scrolling
- automatic shop
- automatic sizing
- automatic starting
- automatic station
- automatic switching
- automatic telegraphy
- automatic teller
- automatic transmission
- automatical control
- automatically controllability
- automatically operated
- automatics
- automaton
- automnesia
- automonitor
- automotive engineering
- autoredialing
- autoreverse
- autosave
- autotransductor
- aux
- auxiliaries
- auxiliary air
- auxiliary brake
- auxiliary construction
- auxiliary device
- auxiliary electrode
- auxiliary equipment
- auxiliary processor
- auxiliary selector
- auxiliary soring
- auxiliary variable
- auxometer
- availability ratio
- available capacity
- available discharge
- available head
- available population
- avalanche breakdown
- avalanche ionization
- avalanche noise
- avalanche transistor
- avenue
- average acceleration
- average flow
- average remuneration
- average transinformation
- average wage
- averaging
- aviary
- aviation gasoline
- aviation spirit
- aviator
- avionics
- Avogadrós number
- avometer
- awaiting part
- axe
- axial clearance
- axial compressor
- axial field
- axial load
- axial ratio
- axial slot
- axial stress
- axial thrust
- axiom
- axisymmetric
- axle base
- axle body
- axle shaft
- azeotrope
- azeotropic process
- azimuth
- azimuth deviation
- azimuth drive
- azimuth potentiometer