English Dictionary

lunation

/luːˈneɪʃən/

noun

A month of an average of approximately 29.53 days, measured from a lunar phase until the return of that same phase. / The irregular period from one new moon until the next.

The lunation cycle is approximately 29.53 days long.

意味（1）

A month of an average of approximately 29.53 days, measured from a lunar phase until the return of that same phase.

And there is not the moon seen in all the lunation, save only the second quarter.

意味（2）

The irregular period from one new moon until the next.