to fill up, or keep full; to furnish with what is wanted; to afford, or furnish with, a sufficiency; as, rivers are supplied by smaller streams; an aqueduct supplies an artificial lake; -- often followed by with before the thing furnished; as, to supply a furnace with fuel; to supply soldiers with ammunition.-to serve instead of; to take the place of.-to fill temporarily; to serve as substitute for another in, as a vacant place or office; to occupy; to have possession of; as, to supply a pulpit.-to give; to bring or furnish; to provide; as, to supply money for the war.-the act of supplying; supplial.-that which supplies a want; sufficiency of things for use or want.-auxiliary troops or reenforcements.-the food, and the like, which meets the daily necessities of an army or other large body of men; store; -- used chiefly in the plural; as, the army was discontented for lack of supplies.-an amount of money provided, as by parliament or congress, to meet the annual national expenditures; generally in the plural; as, to vote supplies.-a person who fills a place for a time; one who supplies the place of another; a substitute; esp., a clergyman who supplies a vacant pulpit.-serving to contain, deliver, or regulate a supply of anything; as, a supply tank or valve.