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libration

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noun li·bra·tion \lī-ˈbrā-shən\

Definition of libration

  1. :  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

librational

play \lī-ˈbrā-shnəl, -shə-nəl\ adjective

libratory

play \ˈlī-brə-ˌtȯr-ē\ adjective

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Origin and Etymology of libration

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

Learn More about libration

  1. Britannica.com: Encyclopedia article about libration

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