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WordReference Random House Learner's Dictionary of American English © 2024ˈstand•ard ˌtime, n. [countable]- Timethe official time adopted for a country or region, with a difference of exactly one hour between one zone and the next.
WordReference Random House Unabridged Dictionary of American English © 2024stand′ard time′, - Timethe civil time officially adopted for a country or region, usually the civil time of some specific meridian lying within the region. The standard time zones in the U.S.(Atlantic time, Eastern time, Central time, Mountain time, Pacific time, Yukon time, Alaska-Hawaii time, and Bering time)use the civil times of the 60th, 75th, 90th, 105th, 120th, 135th, 150th, and 165th meridians respectively, the difference of time between one zone and the next being exactly one hour. See diag. under time zone.
Collins Concise English Dictionary © HarperCollins Publishers:: standard time n - the official local time of a region or country determined by the distance from Greenwich of a line of longitude passing through the area
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