libration
li·bra·tion
noun \lī-ˈbrā-shən\Definition of LIBRATION
: 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
Origin of LIBRATION
Latin libration-, libratio, from librare to balance, from libra scales
First Known Use: 1667
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