I. Natural vigor, vital force, tenaciousness or length of life, vivaciousness (post-Aug.): “tam angustis terminis tantae multitudinis vivacitas continetur,” Plin. Ep. 3, 7, 13; Col. 11, 3, 41; Plin. 8, 24, 41, § 101; Quint. 6, praef. 3; Val. Max. 8, 13, ext. 4; Tert. Anim. 25.— Plur., App. de Mundo, 58, 15.—
vīvācĭtas , ātis, f. vivax.