/ Dictionary / Index W warm front: Meaning and Definition of Find definitions for: warm' front" Pronunciation: [key] — Meteorol. Meteorol. a transition zone between a mass of warm air and the colder air it is replacing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. warmer-upper warm-hearted Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language