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[loo-ney-shuh n] /luˈneɪ ʃən/
the period of time from one new moon to the next (about 29½ days); a lunar month.
Origin of lunation
1350-1400; Middle English lunacyon < Medieval Latin lūnātiōn- (stem of lūnātiō). See Luna, -ation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for lunation
Historical Examples
  • 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
  • And there the moon is not seen in all the lunation, except in the second quarter.

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

  • Now that lunation having commenced on the 3rd of December, and consisting of thirty days, will end on the 1st of January.

  • In fact, the year and the lunation are to one another very nearly in the proportion of 235 to 19.

    Astronomical Myths John F. Blake
  • So that in both these cases fever commenced in half a lunation after the contagion was received.

    Zoonomia, Vol. II Erasmus Darwin
  • And there is not the moon seen in all the lunation, save only the second quarter.

  • The fever and eruption in the distinct kind take up another quarter of a lunation, and the maturation another quarter.

    Zoonomia, Vol. II Erasmus Darwin
  • lunation is a term sometimes given to the moon's period from any definite phase round to the same phase again.

    Astronomy David Todd
British Dictionary definitions for lunation


another name for synodic month See month (sense 6)
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
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Word Origin and History for lunation

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

Online Etymology Dictionary, © 2010 Douglas Harper
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