- association list
- associative processor
- assortment
- assumed function
- assumed stress
- assure
- astatizing force
- asterism
- astigmatic lens
- astral lamp
- astrologer
- astronaut
- astronomical table
- asylum
- asymmetric
- asymmetry
- asymptote
- asymptotic path
- asymptotic stability
- asymptotical
- asynchronous
- asynchronous compensator
- asynchronous line
- asynchronous timing
- at
- at jacking
- athermal
- atmospheric absorption
- atmospheric air
- atmospheric discharge
- atmospheric interference
- atmospheric moisture
- atmospheric noise
- atmospheric precipitation
- atmospheric rainfall
- atmospheric temperature
- atmospheric water
- atmospherical
- atom
- atomic blast
- atomic bomb
- atomic bond
- atomic lattice
- atomic nucleus
- atomic pile
- atomic power
- atomic theory
- atomicity
- atomized lubrication
- atomizing drying
- atop beam
- atopen
- attach
- attach-ability
- attached device
- attached pier
- attached thermometer
- attached unit
- attached variable
- attaching
- attaching device
- attachment
- attachment screw
- attack
- attack drill
- attack drilling
- attacked pier
- attain
- attal
- attemperator
- attemporate
- attempt
- attendance
- attendance button
- attendant
- attendant room
- attended
- attended time
- attendees
- attention
- attention interruption
- attention key
- attentive
- attenuate
- attenuated lathe
- attenuation
- attenuation band
- attenuation box
- attenuation coefficient
- attenuation constant
- attenuation distortion
- attenuation factor
- attenuator
- attenuator grating
- attic
- attic floor
- attic ladder
- attic stairway
- attic storey
- attle