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librationMain Entry: li·bra·tion Pronunciation: \lī-ˈbrā-shən\ Function: noun Etymology: Latin libration-, libratio, from librare to balance, from libra scales Date: 1667 : 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 — li·bra·tion·al \-shnəl, -shə-nəl\ adjective — li·bra·to·ry \ˈlī-brə-ˌtȯr-ē\ adjective
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