paɪ ˈfʌŋk(t)ʃənəl ˈɒpəɹətɪv ˈɒpəɹətɪv ˈɹʌnɪŋ ˈʃɑːməs ˈsɜːdʒɪkəl ˈsɝdʒɪkəl being in force or having or exerting force operative regulations the major tendencies operative in the American political system (of e.g. a machine) performing or capable of performing in running (or working) order a functional set of brakes relating to or requiring or amenable to treatment by surgery especially as opposed to medicine a surgical appendix a surgical procedure operative dentistry effective; producing a desired effect the operative word someone who can be employed as a detective to collect information and assist in criminal investigations a person secretly employed in espionage for a government