(1):
(n.) One to whom is committed some charge, duty, or office, by a superior power; a commissioner.
(2):
(n.) An officer of the bishop, who exercises ecclesiastical jurisdiction in parts of the diocese at a distance from the residence of the bishop.
(3):
(n.) An officer having charge of a special service; as, the commissary of musters.
(4):
(n.) An officer whose business is to provide food for a body of troops or a military post; - officially called commissary of subsistence.