prime meridian

noun

Definition of prime meridian 

: the meridian of 0 degrees longitude which runs through the original site of the Royal Observatory at Greenwich, England, and from which other longitudes are reckoned

First Known Use of prime meridian

1884, in the meaning defined above

Keep scrolling for more

Learn More about prime meridian

Share prime meridian

Statistics for prime meridian

Look-up Popularity

Time Traveler for prime meridian

The first known use of prime meridian was in 1884

See more words from the same year

More from Merriam-Webster on prime meridian

See words that rhyme with prime meridian

Britannica.com: Encyclopedia article about prime meridian

Comments on prime meridian

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

WORD OF THE DAY

to reject or criticize sharply

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Bee Cubed

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

TAKE THE QUIZ

Love words? Need even more definitions?

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