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Greenwich Time

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noun
  1. the time as measured on the prime meridian running through Greenwich, England: used in England and as a standard of calculation elsewhere.
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Origin of Greenwich Time

First recorded in 1840–50
Also called Greenwich Mean Time, Greenwich Civil Time, universal time, Universal Time.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for greenwich mean time

Greenwich Mean Time

Greenwich Time

noun
  1. mean solar time on the 0° meridian passing through Greenwich, England, measured from midnight: formerly a standard time in Britain and a basis for calculating times throughout most of the world, it has been replaced by an atomic timescaleAbbreviation: GMT See universal time
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usage

The name Greenwich mean time is ambiguous, having been measured from mean midday in astronomy up to 1925, and is not used for scientific purposes. It is generally and incorrectly used in the sense of universal coordinated time, an atomic timescale available since 1972 from broadcast signals, in addition to the earliest sense of universal time, adopted internationally in 1928 as the name for GMT measured from midnight
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

greenwich mean time in Science

Greenwich Mean Time

[grĕnĭch]
  1. See universal time.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.