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libration

play
noun li·bra·tion \lī-ˈbrā-shən\

Definition of libration

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

librational play \-shnəl, -shə-nəl\ adjective
libratory play \ˈlī-brə-ˌtȯr-ē\ adjective


Origin of libration

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


First Known Use: 1667


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