- air cock
- air compartment
- air compression
- air compressor
- air conditioning
- air conduction
- air deflector
- air drill
- air drying
- air entraining
- air exchanger
- air face
- air gage
- air gate
- air handling
- air hoist
- air infiltration
- air jig
- air law
- air lift
- air motor
- air patenting
- air photography
- air pocket
- air regulator
- air screen
- air separator
- air shower
- air supply
- air vent
- air washer
- air way
- air-actuated
- air-conditioner
- air-cooled
- air-dried
- air-driven
- air-free
- air-permeable
- air-system
- air-tube
- airblast chilling
- airblast refrigeration
- airborne dust
- airbrush
- airbrushing
- aircraft category
- aircrafted concrete
- airdrome
- airfield runway
- airless spraying
- airometer
- airview
- aisle way
- alarm signal
- alate termite
- alcoholic varnish
- aleak
- alert box
- algam
- algebraic equation
- algebraic language
- algebraic value
- algebraical equation
- algebraical function
- algorithm
- algorithmic description
- aliantoic sac
- aliasing
- alidade
- alife
- align
- align left
- align right
- aligning
- aligning pole
- aligning tool
- alignment
- alignment chart
- alignment equipment
- alignment pin
- alimentation
- aliphatic products
- aliquot
- alite
- alive
- alkali fermentation
- alkali liquor
- alkali strength
- alkaline
- alkaline battery
- alkaline soil
- alkalinity
- alkyd varnish
- all-purpose
- all-up
- all-welded
- allantoic vesicle
- alley
- alligator grab