That operates to produce an effect.

An operative person or thing. / (psychology) Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.

plural of operant

One who operates. / A telecommunications facilitator whose job is to establish temporary network connections.

The method by which a device performs its function. / The method or practice by which actions are done. / The act or process of operating; agency; the exertion of power, physical, mechanical, or moral.

(transitive or intransitive) To perform a work or labour; to exert power or strength, physical or mechanical; to act.

Of or relating to operations, especially military operations. / Functioning and ready for use. / Effective or operative. / Determined by means of practical measures.

In operation; that operates. / Involved in an operation.

present participle and gerund of operate

Effectual or important. / Functional, in working order. / Having the power of acting; hence, exerting force, physical or moral; active in the production of effects.