Having the power to produce a required effect or effects.
approximate; Not describing the fundamental dynamic changes in some system as they happen.
Efficient, serviceable, or operative, available for useful work.
Having no negative coefficients.
Producing a decided or decisive effect.
Actually in effect.
a soldier fit for duty
That operates to produce an effect.
Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.
An operative person or thing.