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Computing (FOLDOC) dictionary (also found in English - English (Wordnet), )
Greenwich Mean Time
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time, standard (GMT) The local time on the Greenwich
meridian, based on the hypothetical mean sun (which averages
out the effects of the Earth's elliptical orbit and its tilted
axis). GMT is the basis of the civil time for the UK.
In 1925 the reference point was changed from noon to midnight
and it was recommended that the term "Universal Time" should
be used for the new GMT.