What does "lunation" mean?

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

What is a synonym for "lunation"?

Common synonyms include: lunar month, synodic month, annum, century, day, decade.

Pronounced //luːˈneɪʃən//.

//luːˈneɪʃən// noun

noun ·Uncommon ·Advanced level

Noun

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."
2
the period between successive new moons (29.531 days) wordnet
3
The irregular period from one new moon until the next.