(1):
(v.) The wane of the moon.
(2):
(n.) To grow less, - opposed to increase; to be diminished gradually, in size, degree, number, duration, etc., or in strength, quality, or excellence; as, they days decrease in length from June to December.
(3):
(v. t.) To cause to grow less; to diminish gradually; as, extravagance decreases one's means.
(4):
(v.) A becoming less; gradual diminution; decay; as, a decrease of revenue or of strength.