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Libration

noun

Definitions

Noun
  1. 1
    The act of librating. countable, uncountable
  2. 2
    (astronomy) a real or apparent slow oscillation of a moon or satellite wordnet
  3. 3
    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. countable, uncountable
  4. 4
    A similar rotational or orbital characteristic of some other celestial body. broadly, countable, uncountable
  5. 5
    The oscillation of an angle about a stable equilibrium point. countable, uncountable
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  1. 6
    A vibrational degree of freedom whereby a group of atoms partly rotates back and forth, similar to the Moon's motion. countable, uncountable

Etymology

From Latin lībrātiō (“a hurling, swinging”), from lībrō (“poise, cause to swing”).

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