/ Dictionary / Index S stepbrother: Meaning and Definition of Find definitions for: step•broth•er Pronunciation: (step'bru"ur), [key] — n. one's stepfather's son or stepmother's son by a previous marriage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: stepbrother (Thesaurus) step-and-repeat stepchair Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language