Difference between Decrease and Diminish

Decrease

Part of speech: noun

Definition: An amount by which a quantity is decreased.

Part of speech: verb

Definition: Of a quantity, to become smaller. To make (a quantity) smaller.

Example sentence: You cannot communicate complicated information to large groups of people. As you increase the number of people, you have to decrease the complexity of the information.

Diminish

Part of speech: verb

Definition: To make smaller.To become smaller.To taper.To reduce a perfect or minor interval by a semitone.

Example sentence: You must strive to multiply bread so that it suffices for the tables of mankind, and not rather favor an artificial control of birth, which would be irrational, in order to diminish the number of guests at the banquet of life.