/ Dictionary / Index R richen: Meaning and Definition of Find definitions for: rich•en Pronunciation: (rich'un), [key] — v.t., v.i. to make or become rich or richer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Richelieu riches Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language