Greenwich mean time

noun, often capitalized M&T
Green·​wich mean time | \ ˈgri-nij- How to pronounce Greenwich mean time (audio) , ˈgre-, -nich- \

Definition of Greenwich mean time

: the mean 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

First Known Use of Greenwich mean time

1863, in the meaning defined above

History and Etymology for Greenwich mean time

Greenwich, England

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Time Traveler for Greenwich mean time

Time Traveler

The first known use of Greenwich mean time was in 1863

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Cite this Entry

“Greenwich mean time.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Greenwich%20mean%20time. Accessed 27 Feb. 2020.

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More Definitions for Greenwich mean time

Greenwich mean time

noun
How to pronounce Greenwich mean time (audio)

English Language Learners Definition of Greenwich mean time

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

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