noun lu·na·tion \lü-ˈnā-shən\

Definition of lunation

  1. :  the period of time averaging 29 days, 12 hours, 44 minutes, and 2.8 seconds elapsing between two successive new moons

Origin and Etymology of lunation

Middle English lunacioun, from Anglo-French lunaison, from Medieval Latin lunation-, lunatio, from Latin luna

First Known Use: 14th century

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