n One appointed as the substitute of another, and empowered to act for him, in his name or on behalf of|his behalf; a substitute in office; a lieutenant; a representative; a delegate; a vicegerent; as, the deputy of a prince, of a sheriff, of a township, etc.
n (Ireland) a member of Dáil Éireann, or the title of a member of Dáil Éireann. (Normally capitalised in both cases)