/ Dictionary / Index M MTO: Meaning and Definition of Find definitions for: MTO Pronunciation: [key] (in World War II) Mediterranean Theater of Operations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mtn MTP Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language