• synonyms


[loo-ney-shuh n]
  1. the period of time from one new moon to the next (about 29½ days); a lunar month.
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Origin of lunation

1350–1400; Middle English lunacyon < Medieval Latin lūnātiōn- (stem of lūnātiō). See Luna, -ation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for lunation

Historical Examples of lunation

  • And there the moon is not seen in all the lunation, except in the second quarter.

    Early Travels in Palestine

    Arculf et al.

  • The number 28 corresponds with the number of days in a lunation.

  • And there is not the moon seen in all the lunation, save only the second quarter.

  • Lunation is a term sometimes given to the moon's period from any definite phase round to the same phase again.


    David Todd

  • For, says he, because of the double epact that occurs on the 4th and 5th of April that lunation has only 29 days.

    Our Calendar

    George Nichols Packer

British Dictionary definitions for lunation


  1. another name for synodic month See month (def. 6)
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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

Word Origin and History for lunation


"time from one new moon to another," late 14c., from Medieval Latin lunationem, from luna "moon" (see Luna).

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Online Etymology Dictionary, © 2010 Douglas Harper