Usually means: Periodic oscillation of moon's visibility.
Definitions Related words Phrases Mentions History
We found 28 dictionaries that define the word libration:

General (21 matching dictionaries)
  1. libration: Merriam-Webster
  2. libration: Oxford Learner's Dictionaries
  3. libration: American Heritage Dictionary of the English Language
  4. libration: Collins English Dictionary
  5. libration: Vocabulary.com
  6. Libration, libration, libration: Wordnik
  7. libration: Wiktionary
  8. libration: Webster's New World College Dictionary, 4th Ed.
  9. libration: Infoplease Dictionary
  10. Libration, libration: Dictionary.com
  11. Libration (molecule), Libration: Wikipedia, the Free Encyclopedia
  12. Libration: Online Plain Text English Dictionary
  13. libration: Webster's Revised Unabridged, 1913 Edition
  14. libration: Rhymezone
  15. Libration: AllWords.com Multi-Lingual Dictionary
  16. libration: Webster's 1828 Dictionary
  17. libration: FreeDictionary.org
  18. libration: The Phrontistery - A Dictionary of Obscure Words
  19. libration: Mnemonic Dictionary
  20. libration: TheFreeDictionary.com
  21. libration (f): AllWords.com Multi-Lingual Dictionary

Computing (1 matching dictionary)
  1. libration: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)
  1. libration: A Word A Day

Science (4 matching dictionaries)
  1. From Stargazers to Starships Glossary (No longer online)
  2. Libration: Eric Weisstein's World of Physics
  3. Libration: Extragalactic Astronomy
  4. LIBRATION: Zoom Astronomy Glossary

(Note: See librational as well.)

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.

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