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

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The first known use of libration was in 1667

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Cite this Entry

“Libration.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/libration. Accessed 3 Apr. 2020.

More from Merriam-Webster on libration

Britannica.com: Encyclopedia article about libration

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