See under standard time.
Origin of Mountain time
Also called Mountain Standard Time.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for mountain standard time
Mountain Standard Time
one of the standard times used in North America, seven hours behind Greenwich Mean TimeAbbreviation: MST
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012