I. The fiftieth: “anno trecentesimo et quinquagesimo fere post Romam conditam,” Cic. Rep. 1, 16, 25; 2, 35, 60: “quinquagesimo uno raptus anno,” Plin. 7, 8, 6, § 46: “liba,” Mart. 10, 24, 4.—
II. Subst.: quinquāgēsĭma , ae, f. (sc. pars), a fiftieth part, a fiftieth, as a tax: “ab omnibus enim ternae praeterea quinquagesimae exigebantur,” Cic. Verr. 2, 3, 49, § 116: “binae,” id. ib. 2, 3, 78, § 181.