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lunar month

month (def 5).
Origin of lunar month
First recorded in 1585-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for lunar month

lunar month

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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lunar month in Science
lunar month  
The average time between successive occurrences of the same phase of the Moon, equal to approximately 29 days, 12 hours, 44 minutes. Depending on the lunar calendar being used, a lunar month can begin with the new moon or the full moon. Also called lunation, synodic month. ◇ A period of 12 lunar months is a lunar year.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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