·v The wane of the moon.
II. Decrease ·v A becoming less; gradual diminution; decay; as, a decrease of revenue or of strength.
III. Decrease ·vt To cause to grow less; to diminish gradually; as, extravagance decreases one's means.
IV. Decrease ·noun 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.