- air data calibration technique
- air data measurement
- air data system
- air defence works design
- air defense early warning system
- air defense identification zone
- air-defense missile system
- air defense partition door
- air defense warning and command system
- airdent
- air-depolarized
- air Diffusion performance index
- air diffusion performance index
- air disinfection
- air-distillation
- air distribution system
- air distribution system performance evaluation
- air distributor
- air door
- airdox
- air drag
- air drawing
- Air dried bloodstain
- air-dried timber
- air drilling