Greenwich Mean TimePronunciation: /ɡrɛnɪtʃˈmiːntʌɪm/ (abbreviation: GMT, also Greenwich time)Translate Greenwich Mean Time | into Spanish Definition of Greenwich Mean Time noun [mass noun] the mean solar time at the Greenwich meridian, adopted as the standard time in a zone that includes the British Isles. Greenwich Mean Time in other Oxford dictionaries Definition of Greenwich Mean Time in the US English dictionary
