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Decrease (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.
Decrease (v. t.) To cause to grow less; to diminish gradually; as, extravagance decreases one's means.
Decrease (v.) A becoming less; gradual diminution; decay; as, a decrease of revenue or of strength.
Decrease (v.) The wane of the moon.