air - anti
- all-textile tire
- all-thread(ed) nipple
- all-thread(ed) nipple
- all-time record temperature
- all-to-all relay
- all-watt motor
- all-wave radiometer
- all-wave receiver
- all-weather aircraft
- all-weather flying
- all-weather liquefied petroleum gas
- all-weather mapping
- all-weather operations
- all-weather survey
- all-weather tire
- all-welded cab
- all-welded frame
- all-welded underframe
- all-wheel drive
- all-wheel drive tractor
- all-wheel drive truck
- all-wheel drive vehicle
- all-wheel ground contact
- all-wing aircraft
- all-wire tire
- all-wood paper
- all-zero filter
- all-zero function
- allele
- Allen key
- Allen wrench
- Allen(-head) screw
- Allen(-head) screw
- Allen-Moore cell
- Allen-set screw
- alley
- alleyway
- allied substances
- alligator
- alligator blade