acti - alar
- action
- action turbine
- activate
- activate button
- activating
- activation current
- active area
- active branch
- active circuit
- active component
- active content of reservoir
- active current
- active drainage piping
- active energy meter
- active four-terminal network
- active gage length
- active gas purification
- active load
- active load management
- active plate
- active polar surface
- active power
- active power filter
- active power imbalance
- active power losses
- active power relay
- active power shortage
- active q-switching
- active quadrature
- active quadripole
- active relay
- active repair time
- active volt-ampere
- active water treatment plant
- active zone
- active-energy meter
- active-power transfer
- activity
- activity expected time
- activity float