American Heritage® Dictionary of the English Language, Fourth Edition
- n. See lunar month.
- n. 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.
- n. the variably cyclic period from one new moon until the next.
- n. the period between successive new moons (29.531 days)
- synodic + month (Wiktionary)
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