plural of optical activity

plural of displacement activity

plural of catalytic activity

That responds to spoken commands.

plural of active ingredient

The real component of the power of an alternating current circuit; the product of the voltage and that part of the current that is in phase with the voltage

A geologic fault which has exhibited seismic activity within a geologically recent time period.

plural of CH activation

(idiomatic) A very busy place.

plural of active front