(1):

(v. i.) To relinquish or renounce a throne, or other high office or dignity.

(2):

(v. t.) To surrender or relinquish, as sovereign power; to withdraw definitely from filling or exercising, as a high office, station, dignity; as, to abdicate the throne, the crown, the papacy.

(3):

(v. t.) To renounce; to relinquish; - said of authority, a trust, duty, right, etc.

(4):

(v. t.) To reject; to cast off.

(5):

(v. t.) To disclaim and expel from the family, as a father his child; to disown; to disinherit.