Perénnitas, pen. cor. huius perennitâtis, f. g. Col. Continuance: long abiding.Vt quam longissimam perennitatem stirpi acquirat. Colu. Gelidæ fontium perennitates.Cic.Perenniseruus.He that alway serueth one maister.
Lewis and Short: Latin dictionary
pĕrennĭtas, ātis, f. [id.], lastingness, continuance, perpetual duration, perpetuity (class.): fontium perennitates, Cic. N. D. 2, 39, 98: cibi,
constant food
, Plaut. Pers. 3, 1, 2: perennitatem conditis frumentis afferunt, Col. 1, 6, 10: vitae, Ambros. in Psa. 118, Serm. 13, 22: Perennitas, a title of the Roman emperors: vestra,