Greenwich Mean Time

Green·​wich Mean Time | \ ˈgri-nij- How to pronounce Greenwich Mean Time (audio) , ˈgre-, -nich- \

Definition of Greenwich Mean Time

: the mean time that is associated with the prime meridian of Greenwich, England, and historically used as the prime basis of standard time throughout the world The British traditionally used Greenwich Mean Time, calculated from the meridian running through Greenwich, a borough of London.The New York Times Coordinated Universal Time is what used to be called Greenwich Mean Time, but the new name doesn't make it any more universal than it ever was, and it remains a time zone centered in Britain.— Natalie Angier abbreviation GMT

called also Greenwich Time

— compare coordinated universal time

First Known Use of Greenwich Mean Time

1782, in the meaning defined above

History and Etymology for Greenwich Mean Time

Greenwich, England

Keep scrolling for more

Learn More about Greenwich Mean Time

Time Traveler for Greenwich Mean Time

Time Traveler

The first known use of Greenwich Mean Time was in 1782

See more words from the same year

Statistics for Greenwich Mean Time

Last Updated

27 Apr 2020

Cite this Entry

“Greenwich Mean Time.” Dictionary, Merriam-Webster, Accessed 27 May. 2020.

Comments on Greenwich Mean Time

What made you want to look up Greenwich Mean Time? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

Obscure Shapes

  • a pile of three dimensional shapes in green
  • Something that is ooid is shaped like:
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!