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standard time
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- the time in any of the 24 time zones, each an hour apart, into which the earth is divided: it is based on distance east or west of Greenwich, England; the 8 zones of North America (Atlantic, Eastern, Central, Mountain, Pacific, Alaska, Hawaii-Aleutian, and Samoa) use the mean solar times of the 60th, 75th, 90th, 105th, 120th, 135th, 150th, and 165th meridians, respectively
- the official time, whether mean solar time or daylight saving time, in any given region
See standard time in American Heritage Dictionary 4
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