GMT /ˌdʒiː em ˈtiː/ noun [uncountable] British English
(Greenwich Mean Time) the time as measured at Greenwich in London, that is used as an international standard for measuring time

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GMT
Greenwich Mean Time - a place in England used as the standard for time around the world
The rocket will be launched at 10:00 AM tomorrow GMT.

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GMT
Greenwich Mean Time (zulu or UTC)

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G.M.T.
Greenwich Mean Time

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