operant

Operating to produce effects; effective.

Of, relating to, or being a response that occurs spontaneously and is identified by its reinforcing or inhibiting effects.

One that operates.

An element of operant behavior.

Working; engaged in action; active; operative; effective.

One who operates; an operator or operative; a worker or workman.

Operative.

That operates to produce an effect.

An operative person or thing.

A class of behavior that produces consequences by operating (i.e., acting) upon the environment.