
1) Lunar month 2) Month 3) Moon 4) Synodic month
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https://www.crosswordclues.com/clue/lunation

Lunation is the mean (average) time for one lunar phase cycle (i.e., the synodic period of the Moon, or the amount of time from one new moon to the next). In the year 2000, the average length of a lunation was 29.530588 days (or 29 days, 12 hours, 44 minutes, and 3 seconds). However, the length of any one synodic month can vary from 29.26 to 29.80...
Found on
http://en.wikipedia.org/wiki/Lunation

lunar month; interval between successive new moons
Found on
http://phrontistery.info/l.html

the time between two successive new moons; approximately 29.5 days.
Found on
http://planetfacts.org/space-terms/

• (n.) The period of a synodic revolution of the moon, or the time from one new moon to the next; varying in length, at different times, from about 29/ to 29/ days, the average length being 29 d., 12h., 44m., 2.9s.
Found on
http://thinkexist.com/dictionary/meaning/lunation/

The time taken for the Moon to go through one complete cycle of phases; it is the same as a synodic month.
Found on
http://www.daviddarling.info/encyclopedia/L/lunation.html

One complete cycle of phases by the Moon, 29.53 days. A lunation is also known as a Synodic month.
Found on
http://www.encyclo.co.uk/local/20448
Lu·na'tion noun [ Confer
Lunated .] The period of a synodic revolution of the moon, or the time from one new moon to the next; varying in length, at different times, from about 29¼ to 29⅚ days, the average length being 29 d., 12h., 44m., 2.9s.
Found on
http://www.encyclo.co.uk/webster/L/69

The interval of a complete lunar cycle, between one new Moon and the next. A lunation is equal to 29 days, 12 hours, and 44 minutes.
Found on
http://www.seasky.org/astronomy/astronomy-glossary.html

lunation 1. The time from one new moon to the next, constituting a lunar month (29.5 days). 2. The time of the full moon.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1218/2

Period between new moons. 29 days 12 hours 44 minutes.
Found on
https://www.encyclo.co.uk/local/22784

the period of time from one new moon to the next (about 29 days); a lunar month.
Found on
https://www.infoplease.com/dictionary/lunation
No exact match found.