Meaning of GMT in English

GMT

/ ˌdʒiː em ˈtiː; NAmE / noun

[ U ] 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)

For more information see the Cultural Guide

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.