Mountain-standard-time meaning

Standard time in the seventh time zone west of Greenwich, England, reckoned at 105° west and used in the Rocky Mountain states of the United States.
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A standard time used in the zone which includes the Rocky Mountain region of the U.S. corresponding to the mean solar time of the 105th meridian west of Greenwich, England: it is seven hours behind Greenwich time.
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The time of day in the time zone that encompasses the segment of the United States that includes the Rocky Mountains.
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