I.of ten years, decennial (late Lat.; cf. “decennis): bellum, i. e. Caesar's in Gaul,” Amm. 15, 12, 6; “of the Trojan war,” Hier. adv. Jovin. 1, 48.—
II. Subst.: DECENNALIA (ium, n.), a festival celebrated every ten years after the time of Augustus, Trebell. Gallien. 21, 5; Inscr. Grut. 116, 4; v. decennis fin.