LUNATION

lunation. Lunation, n. a revolution of the moon

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Lu‐na″tion (?), n. [[Cf. 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.