acid - alde
- activated support
- activating
- activating agent
- activation analysis
- activation antigen
- activation center
- activation energy
- activation heat
- activation process
- activator
- activator constant
- active absorption
- active adherence
- active area
- active center
- active component
- active conditioned reflex
- active countermeasures
- active current
- active douplet
- active electrode
- active energy meter
- active fiber
- active filter
- active guidance
- active homing guidance
- active immunity
- active immunization
- active jamming
- active laser element
- active laser substance
- active liquid
- active material
- active metabolism
- active mode locking
- active night viewer
- active nightviewer
- active power
- active power meter
- active precursor
