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li·bra·tion | \ lī-ˈbrā-shən 
\
\Definition of libration
: 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
Other Words from libration
librational \ lī-ˈbrā-shnəl , -shə-nᵊl \ adjective
, -shə-nᵊl \ adjectivelibratory \ ˈlī-brə-ˌtȯr-ē \ adjective
\ adjectiveKeep scrolling for more
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Merriam-Webster unabridgedWords at Play
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Time Traveler for libration
The first known use of libration was in 1667
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