a-battery - adobe soil
- action potential
- action turbine
- activated bath
- activated cathode
- activated cyaniding
- activated material
- activated plasma
- activated sludge
- activated water
- activating radiation
- activating signal
- activation analysis
- activation energy
- activation heat
- activation method
- active car
- active carbon
- active component
- active cooling surface
- active dust
- active emanation
- active face
- active filler
- active flutter control
- active guidance system
- active homing
- active homing guidance
- active homing head
- active line
- active mass
- active material
- active network
- active nucleus
- active plate
- active product
- active radar augmenter
- active storage
- active storage capacity
- active valence
- active valency
