(1):
(n.) A chief; one who has supreme authority; a leader; the chief officer of an army, or of any division of it.
(2):
(n.) An officer who ranks next below a captain, - ranking with a lieutenant colonel in the army.
(3):
(n.) The chief officer of a commandery.
(4):
(n.) A heavy beetle or wooden mallet, used in paving, in sail lofts, etc.