Breadcrumb Home > Thesaurus > M Synonyms of mst Find synonyms for: Noun 1. Mountain Time, Mountain Standard Time, MST, civil time, standard time, local time usage: standard time in the 7th time zone west of Greenwich, reckoned at the 105th meridian west; used in the mountain states of the United States WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of mst (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: picaresque Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language