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libration

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
libration [lī′brā·shən]
(physics)
Any oscillatory rotational motion, such as that of the moon, or of a molecule in a solid which does not have enough energy to make full rotations.
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So, then the moon displays invariably the same face to the earth; nevertheless, to be quite exact, it is necessary to add that, in consequence of certain fluctuations of north and south, and of west and east, termed her libration, she permits rather more than half, that is to say, five-sevenths, to be seen.
From The Earth To The Moon by Verne, Jules View in context
 
 
 
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