Hypertext Webster Gateway: "lunation"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Lunation \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 291/4 to 295/6 days, the average
length being 29 d., 12h., 44m., 2.9s.
From WordNet (r) 1.7 (wn)
lunation
n : the period between successive new moons (29.531 days) [syn:
{lunar month}, {moon}, {synodic month}]
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