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-ˌtr-ē\ adjective

Origin of LIBRATION

Latin libration-, libratio, from librare to balance, from libra scales
First Known Use: 1667

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