greenwich mean time n the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere Synonym(s) Greenwich Mean Time Greenwich Time GMT universal time UT UT1
News & Articles greenwich mean time '24: Live Another Day' will be set in England Jack Bauer is resetting his clock for more "24," and this time he's going to have to set it to Greenwich Mean Time. Oct. 3, 2013 - Los Angeles Times