Nōn'a-gĕs'i-mal1, a.
a. [Fr. nonagésime, from Lat. nonagesimus, the ninetieth, from nonaginta, ninety. See supra.] Pertaining to a nonagesimal.
2 entries under this word
Nonagesimal
Nōn'a-gĕs'i-mal2, n.
n. (Astron.) The middle or highest point of that part of the ecliptic which is at any given moment above the horizon. It is the ninetieth degree of the ecliptic, reckoned from the points in which it is intersected by the horizon. Bouvier.