Examples from the Web for lunation
And there is not the moon seen in all the lunation, save only the second quarter.The Travels of Sir John Mandeville|John Mandeville
Now that lunation having commenced on the 3rd of December, and consisting of thirty days, will end on the 1st of January.
The number 28 corresponds with the number of days in a lunation.Chaucer's Works, Volume 5 (of 7) -- Notes to the Canterbury Tales|Geoffrey Chaucer
In fact, the year and the lunation are to one another very nearly in the proportion of 235 to 19.Astronomical Myths|John F. Blake
So that in both these cases fever commenced in half a lunation after the contagion was received.Zoonomia, Vol. II|Erasmus Darwin
British Dictionary definitions for lunation
Word Origin and History for lunation
"time from one new moon to another," late 14c., from Medieval Latin lunationem, from luna "moon" (see Luna).