/ Dictionary / Index G guestimate: Meaning and Definition of Find definitions for: gues•ti•mate Pronunciation: (v.ges'tu-māt"n.ges'tu-mit, -māt") [key] — n. -mat•ed, -mat•ing, guesstimate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: guestimate (Thesaurus) guesthouse guestlist 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