Nonagenarius, pro Nonagesimo: vt, Nonagenarius motus. Plin. The ninetieth.
Lewis and Short: Latin dictionary
nōnāgēnārĭus, a, um, adj. [nonageni], that contains or consists of ninety. I. In gen.: nonagenarius motus stellae Martis,
ninety degrees distant from the sun
, Plin. 2, 15, 12, 60: fistula,
made of a sheet of lead ninety inches wide
, Front. Aquaed. 60.—II. In partic., as subst.: nōnā-gēnārĭus, i, m., a commander of ninety men, Inscr. Orell. 3628; cf. Veg. Mil. 2, 8.— III.Ninety years old, Vulg. Gen. 17, 17.