noun Usage: often capitalized M&T Etymology: Greenwich, England Date: 1863 the mean solar time of the meridian of Greenwich used historically as the prime basis of standard time throughout the world
GREENWICH MEAN TIME
Meaning of GREENWICH MEAN TIME in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012