libration

noun
li·​bra·​tion | \ lī-ˈbrā-shən How to pronounce libration (audio) \

Definition of libration

: an oscillation in the apparent aspect of a secondary body (such as a planet or a satellite) as seen from the primary object around which it revolves

Other Words from libration

librational \ lī-​ˈbrā-​shnəl How to pronounce librational (audio) , -​shə-​nᵊl \ adjective
libratory \ ˈlī-​brə-​ˌtȯr-​ē How to pronounce libratory (audio) \ adjective

First Known Use of libration

1667, in the meaning defined above

History and Etymology for libration

Latin libration-, libratio, from librare to balance, from libra scales

Keep scrolling for more

Learn More about libration

Statistics for libration

Look-up Popularity

Time Traveler for libration

The first known use of libration was in 1667

See more words from the same year

More from Merriam-Webster on libration

Britannica.com: Encyclopedia article about libration

Comments on libration

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

WORD OF THE DAY

a secret plot to overthrow a government

Get Word of the Day daily email!

Test Your Vocabulary

April 2019 Words of the Day Quiz

  • a bird amidst buds
  • Which is a synonym of propitious?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
SCRABBLE® Sprint

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!