operative -- (being in force or having or exerting force; "operative regulations"; "the major tendencies operative in the American political system")
surgical, operative -- (relating to or requiring or amenable to treatment by surgery especially as opposed to medicine; "a surgical appendix"; "a surgical procedure"; "operative dentistry")
operative -- (effective; producing a desired effect; "the operative word")
running, operative, functional, working -- ((of e.g. a machine) performing or capable of performing; "in running (or working) order"; "a functional set of brakes")