from The American Heritage® Dictionary of the English Language, 4th 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- 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.
from the GNU version of the Collaborative International Dictionary of English
- 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 Pacific time, 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.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the official time in a local region (adjusted for location around the Earth); established by law or custom
Sorry, no etymologies found.