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.

Example:
What happens when you Decrease the temp of a chemical equation?

Taxonomy
Dictionary, Synonyms, reduction, intensity, kris, krees, abate, shrink, word origin, crease, quantity, decline, decreases, Houghton Mifflin Company, free online English dictionary, dictionary results, pronunciation, free online dictionary.

Defination from the web:
Decrease - Definition of Decrease at Dictionary.com a free online dictionary with pronunciation, synonyms, and translation of Decrease. Word of the Day and Crossword Puzzles. ... Abate stresses a decrease in amount or intensity and suggests a reduction of excess: Toward evening the ...