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2 definitions found
 for Greenwich Mean Time
From WordNet (r) 3.0 (2006) :

  Greenwich Mean Time
      n 1: the local time at the 0 meridian passing through Greenwich,
           England; it is the same everywhere [syn: Greenwich Mean
           Time, Greenwich Time, GMT, universal time, UT,
           UT1]

From The Free On-line Dictionary of Computing (18 March 2015) :

  Greenwich Mean Time
  
      (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.
  
     Authorities disagreed on whether GMT equates with UT0 or
     UT1, however the differences between the two are of the
     order of thousandths of a second.  GMT is no longer used for
     scientific purposes.
  
     (2001-08-02)
  

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