/ Dictionary / Index M Mountain time: Meaning and Definition of Find definitions for: Moun'tain time". Pronunciation: [key] See underAlso called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mountain system mountaintop Related Content Daily Word Quiz: boorish Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language