(1):
(n.) The grantee of a fief, feud, or fee; one who holds land of superior, and who vows fidelity and homage to him; a feudatory; a feudal tenant.
(2):
(v. t.) To treat as a vassal; to subject to control; to enslave.
(3):
(n.) A subject; a dependent; a servant; a slave.
(4):
(a.) Resembling a vassal; slavish; servile.