month a time unit of approximately 30 days; "he was given a month to pay the bill"
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Wiktionary
Substantiv
synodic month -
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.
synodic month -
The variably cyclic period from one new moon until the next.
