/ Dictionary / Index B brighten: Meaning and Definition of Find definitions for: bright•en Pronunciation: (brīt'n), [key] — v.i., v.t. to become or make bright or brighter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: brighten (Thesaurus) bright coal brightener Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language