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English definition of “Greenwich Mean Time”

Greenwich Mean Time

noun [U] uk   /ˌɡren.ɪtʃˈmiːn.taɪm/ (abbreviation GMT) us  
the time at Greenwich, Greater London, that world time zones are based on Days and times of day
(Definition of Greenwich Mean Time from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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