This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The time that elapses between successive new moons, averaging 29 days, 12 hours, 44 minutes; a lunar month.

n. a month of approximately 29.53 days, measured from a lunar phase until the return of that same phase. On average, the number of days between Full Moons is about 29.5306 days. The actual number of days may differ from the average number by more than a half day. From one Full Moon to the next, the number of days in one lunation can vary between 29.272 and 29.833 days.

n. The irregular period from one new moon until the next.

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 291/4 to 295/6 days, the average length being 29 d., 12h., 44m., 2.9s.

n. The period of a synodic revolution of the moon, or the time from one new moon to the next.

n. the period between successive new moons (29.531 days)

"(In fact, you may need to look at the free online manual just to understand terms like "lunation" and "Astronomical Julian date.")"

month   

synodic month    lunar month   

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