WordReference Random House Learner's Dictionary of American English © 2020
Green•wich Time /ˈgrɛnɪtʃ ˌtaɪm/USA pronunciation  n. [proper noun]
  • Timethe time as measured on the prime meridian running through Greenwich, England, used in England and as a standard of calculation elsewhere. Also called  ˈGreen•wich ˈMean ˌTime. 

  • WordReference Random House Unabridged Dictionary of American English © 2020
    Greenwich Time′, 
  • Timethe time as measured on the prime meridian running through Greenwich, England: used in England and as a standard of calculation elsewhere. Also called  Greenwich Mean Time′, Greenwich Civil Time′, universal time, Universal Time. 
    • 1840–50

    Collins Concise English Dictionary © HarperCollins Publishers::
    Greenwich Mean Time, Greenwich Time n
    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midnight: formerly a standard time in Britain and a basis for calculating times throughout most of the world, it has been replaced by an atomic timescale
      See universal time
      Abbreviation: GMT
    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

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