/ Dictionary / Index F Fermat's last theorem: Meaning and Definition of Find definitions for: Fer•mat's' last' the'orem Pronunciation: (fer-mäz'), [key] — Math. Math. the unproved theorem that the equation x + y = z has no solution for x, y, z nonzero integers when n is greater than 2. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fermata Fermat's principle Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language