Origin: Greek prefix syn-
Synodic month has 2 different meanings across 1 category:
the period between successive new moons (29.531 days)
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.