| Operant 1. (a.) Operative. 2. (n.) An operative person or thing. Thesaurus Entries actor, agent, architect, author, conductor, creator, doer, driver, engineer, executant, executor, executrix, fabricator, functionary, handler, maker, manipulator, medium, mover, operative, operator, performer, perpetrator, pilot, practitioner, prime mover, producer, runner, steersman, subject, worker |