- aggressive agent
- agitating speed
- agitation tank
- agitator truck
- agricultural buildings
- agricultural production
- agricultural resources
- agricultural shed
- agricultural town
- aiming
- aiming stake
- air blast
- air bottle
- air change
- air consumption
- air damper
- air diffuser
- air digger
- air drier
- air duct
- air eliminator
- air embolism
- air entrainment
- air exchange
- air exfiltration
- air grating
- air gun
- air heater
- air humidifying
- air inflow
- air intake
- air ionization
- air jack
- air leakage
- air level
- air lock
- air meter
- air mission
- air outlet
- air output
- air receiver
- air relay
- air resistance
- air saw
- air seasoned
- air shrinkage
- air support
- air transport
- air trap
- air turbine
- air vane
- air whirl
- air-photo
- aircraft factory
- agreeable
- agreement form
- agricultural area
- agricultural belt
- agricultural farm
- agricultural pipe
- agricultural region
- agroindustrial complex
- aileron
- aiming circle
- aimulation
- air balance
- air breakwater
- air caisson
- air chamber
- air chute
- air content
- air dehumidification
- air diffusion
- air heating
- air inlet
- air mixer
- air monitoring
- air noise
- air permeability
- air pollution
- air pulverizer
- air riveter
- air sampling
- air slaking
- air sprayer
- air tool
- air voids
- air vortex
- air-boast
- air-dry
- air-hammer
- air-powered
- air-pressure
- air-proof
- airconditioning fan
- aircraft noise
- airdrome beacon
- airlift pump
- airport runway
- airtight window