As used in this act, the following words and phrases shall have the meanings respectively ascribed to them herein:
(a) "Agency" means a county law enforcement agency established under the provisions of this act.
(b) "Department" means a county law enforcement department established under the provisions of this act.
(c) "Director" means the superintendent of a county law enforcement department appointed under the provisions of this act.
(d) "Law enforcement officer" or "county law enforcement officer" means a law enforcement officer who is a member of a county law enforcement department appointed under the provisions of this act.