A.unchanging, unchangeable, “λόγοι μόνιμοι καὶ ἀ.” Pl.Ti.29b; “ἐπιστήμη” Arist.Top.139b33; “ἡ ἀρετή” Id.MM 1209b13, Stoic.1.50, etc.; κατάληψις ἀ. ὑπὸ λόγου Zenoib.1.20; “πίστεις” Phld.Rh.1.378S. (Sup.).
b. not losing its power, of medicine, Gal.12.422.