from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of the 24 longitudinal divisions of the earth's surface in which a standard time is kept, the primary division being that bisected by the Greenwich meridian. Each zone is 15° of longitude in width, with local variations, and observes a clock time one hour earlier than the zone immediately to the east.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A range of longitudes where a common standard time is used.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of the 24 regions of the globe (loosely divided by longitude) throughout which the same standard time is used


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