Definition of GMT abbreviation from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌdʒiː em ˈtiː//
; NAmE NAmE//ˌdʒiː em ˈtiː//
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Greenwich Mean Time (the time at Greenwich in England on the line of 0° longitude, used in the past for calculating time everywhere in the world) compare UTC
See the Oxford Advanced American Dictionary entry: GMT