Definition of GMT noun from the Oxford Advanced American Dictionary

 

GMT

 noun
noun
NAmE//ˌdʒi ɛm ˈti//
 
[uncountable]
 
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the abbreviation for“Greenwich Mean Time”(the time at Greenwich in England on the line of 0° longitude, used for calculating time everywhere in the world; also called Universal Time)
See the Oxford Advanced Learner's Dictionary entry: GMT