Definitions from Wiktionary (libration)

▸ noun:  The act of librating.
▸ noun:  (astronomy) The apparent wobble or variation in the visible side of the Moon that permanently faces the Earth, allowing observers on Earth to see, over a period of time, slightly more than half of the lunar surface.
▸ noun:  (by extension) A similar rotational or orbital characteristic of some other celestial body.
▸ noun:  (dynamics) The oscillation of an angle about a stable equilibrium point.
▸ noun:  (chemistry) A vibrational degree of freedom whereby a group of atoms partly rotates back and forth, similar to the Moon's motion.
▸ Also see libration



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