Synodic-month meaning

The variably cyclic period from one new moon until the next.
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A month of approximately 29.53 days, measured from a lunar phase until the return of that same phase. The long-term average duration is 29.530 588 days (29 d 12 h 44 min 2.8 s), or about 29 ½ days.
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Origin of synodic-month