- aerial
- aerial wire
- aerlferous
- aero-thermodynamics
- aerodynamic
- aerodynamic heating
- aerodynamic properties
- aerology
- aerometry
- aeronautical station
- aeronomy
- aerosol
- aerostatic balance
- affect
- afocal
- afocal system
- after-cooler
- after-effect
- aftercooled
- aftercooled refrigerant
- aftercooler
- afterglow
- afterhardening
- afterpulse
- age-hardening
- ageing
- ageing room
- agglomerate
- agitation
- aggregate state
- agitating zone
- air battery
- air blast
- air bleeder
- air bypass
- air changes
- air chilled
- air clearance
- air coil
- air consumption
- air damper
- air defrosting
- air diffuser
- air distributor
- air film
- air filtration
- air freezing
- air handler
- air humidificator
- air jet
- air liquefaction
- air lock
- air manifold
- air motion
- air movement
- air nozzle
- air outlet
- air path
- air rate
- air requirements
- air source
- air suction
- air trap
- air velocity
- air washing
- ah
- air
- air agitation
- air capacitor
- air chamber
- air composition
- air conduit
- air diffusion
- air discharge
- air distribution
- air egress
- air exhaust
- air feeder
- air filter
- air heating
- air ingress
- air main
- air mixture
- air noise
- air permeability
- air piping
- air processing
- air purification
- air scrubber
- air sterilizer
- air thawing
- air throw
- air treatment
- air turbulence
- air-cored
- airblast
- airblast system
- airproof
- alarm circuit
- albedometer