One who, or that which, decreases.

plural of decreaser

(rare) The action or process of decreasing; a decrease; diminution. / (rare) That by which something is decreased or diminished; a decrement.

plural of decreasement

An amount by which a quantity is decreased.

(intransitive) Of a quantity, to become smaller. / (transitive) To make (a quantity) smaller.

plural of decrease

Third-person singular simple present indicative form of decrease

simple past tense and past participle of decrease

present participle of decrease