Lunation

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  lunation
       n : the period between successive new moons (29.531 days) [syn:
           {lunar month}, {moon}, {synodic month}]