Definition of lunation
: 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 centurySee Words from the same year
Learn More about lunation
Seen and Heard
What made you want to look up lunation? Please tell us where you read or heard it (including the quote, if possible).