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lunation

[loo-ney-shuh n] /luˈneɪ ʃən/
noun
1.
the period of time from one new moon to the next (about 29½ days); a lunar month.
Origin
1350-1400
1350-1400; Middle English lunacyon < Medieval Latin lūnātiōn- (stem of lūnātiō). See Luna, -ation
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lunation

lunation

/luːˈneɪʃən/
noun
1.
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
n.

"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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