/ Dictionary / Index W warn: Meaning and Definition of Find definitions for: warn Pronunciation: (wôrn), [key] —v.i. to give a warning; caution: to warn of further disasters. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: warn (Thesaurus) warmup Warner Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language