Greenwich mean time


Green·wich mean time

noun, often capitalized M&T \ˈgri-nij-, ˈgre-, -nich-\

: the time in Greenwich, England, that is used as the basis of standard time throughout the world

Full Definition of GREENWICH MEAN TIME

:  the mean solar time of the meridian of Greenwich used historically as the prime basis of standard time throughout the world —called also Greenwich time — compare coordinated universal time

Origin of GREENWICH MEAN TIME

Greenwich, England
First Known Use: 1863

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