I. Momentary, instantaneous (late Lat.): commotio, Lact. de Ira Dei, 21, 8.—
II. That operates quickly or immediately (post-Aug.): “remedium,” Plin. 21, 31, 105, § 180: “venenum,” id. 24, 1, 1, § 2: “(remedium) quam posset velocissimum ac praesentaneum coquere,” Suet. Ner. 33; Sen. Ep. 95, 25.—Subst.: praesentānĕum , i, n., a remedy that operates quickly, Plin. 30, 9, 23, § 79.—Adv.: praesentānĕē , forthwith, immediately (post-class.), Theod. Prisc. ad Tim. Fr. praef. 1.