Lu-nā'tion, n.

n. [It. lunazione, Sp. lunacion, Pr. lunacio, lunaso, Fr. lunaison. 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., 12 h., 44', 2.87".