Definitions for standard time
Random House Webster's College Dictionary
the civil time officially adopted for a country or region, usu. the civil time of some specific meridian lying within the region, with a difference of exactly one hour between one zone and the next. The standard time zones in the U.S. are Atlantic time, Eastern time, Central time, Mountain time, Pacific time, Alaska time,Hawaii-Aleutian time, and Samoa time.
civil time, standard time, local time(noun)
the official time in a local region (adjusted for location around the Earth); established by law or custom
Time as measured by synchronizing clocks in different geographical locations within a time zone to the same time, rather than using the local meridian, as in local mean time or solar time.
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