Operative

Part of speech: noun (n.)

A skilled worker; an artisan; esp., one who operates a machine in a mill or manufactory.

Part of speech: adjective (a.)

1. Having the power of acting; hence, exerting force, physical or moral; active in the production of effects; as, an operative motive. It holds in all operative principles. South.

2. Producing the appropriate or designed effect; efficacious; as, an operative dose, rule, or penalty.

3. Based upon, or consisting of, an operation or operations; as, operative surgery.