American Heritage® Dictionary of the English Language, Fourth Edition
- n. The time in any of 24 time zones, usually the mean solar time at the central meridian of each zone. In the continental United States, there are four standard time zones: Eastern, using the 75th meridian; Central, using the 90th meridian; Mountain, using the 105th meridian; and Pacific, using the 120th meridian.
- n. 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.
GNU Webster's 1913
- n. the civil time that has been established by law or by general usage over a region or country. In England the standard time is Greenwich mean solar time. In the United States and Canada four kinds of standard time have been adopted by the railroads and accepted by the people, viz.,
Eastern, Central, Mountain, and Pacifictime, corresponding severally to the mean local times of the 75th, 90th, 105th, and 120th meridians west from Greenwich, and being therefore five, six, seven, and eight hours slower than Greenwich time.
- n. the official time in a local region (adjusted for location around the Earth); established by law or custom
“So theoretically, every star in our galaxy—along with four hundred million and some starships and outposts—can be located on the surface of the hypersphere and can directly relate their local calendars and clocks to a common standard time that’s an equal distance from everywhere.”
“Her gaze shifted to a big wall clock at the end of the passageway, showing Tongi Phon and standard time and dates.”
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