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libration

[lahy-brey-shuh n]
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noun Astronomy.
  1. a real or apparent oscillatory motion, especially of the moon.
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Origin of libration

1595–1605; < Latin lībrātiōn- (stem of lībrātiō) a balancing. See librate, -ion
Related formsli·bra·tion·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for libration

Contemporary Examples

Historical Examples

  • A list of some of the principal astronomical researches of Lagrange and Laplace:—Libration of the moon.

  • The one on the left illustrates the manner in which the libration in longitude is made apparent.

  • The last of Galileo's great astronomical discoveries related to the libration of the moon.

  • One more astronomical discovery also he was to make—that of the moon's libration.

  • We'd show enough, however, to make it damned impressive, and explain it by libration of the satellite.


British Dictionary definitions for libration

libration

noun
  1. the act or an instance of oscillating
  2. a real or apparent oscillation of the moon enabling approximately 59 per cent of the surface to be visible from the earth over a period of time
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Derived Formslibrational, adjective

Word Origin

C17: from Latin librātus, from librāre to balance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012