n. [ OF. castelain, F. châtelain, L. castellanus pertaining to a castle, an occupant of a caste, LL., a governor of a castle, fr. L. castellum castle, citadel, dim. of castrum fortified place. See Castle, and cf. Chatelaine. ] A governor or warden of a castle. [ 1913 Webster ]

n.; pl. Castellanies [ LL. castellania. ] The lordship of a castle; the extent of land and jurisdiction appertaining to a castle. [ 1913 Webster ]