/ Dictionary / Index G guesstimate: Meaning and Definition of Find definitions for: guess•ti•mate Pronunciation: (v.ges'tu-māt"n.ges'tu-mit, -māt"), [key] — v., n. -mat•ed, -mat•ing, —v.t. to estimate without substantial basis in facts or statistics. —n. an estimate arrived at by guesswork. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: guesstimate (Thesaurus) guess guesswork Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language