Perspicúitas, pen. cor. tâtis, f. g. Cicer.Clearenesse: properly in wordes and sentences: perspicnitie.Prima est eloquentiæ virtus perspicuitas. Quin. Perspicuitie is the first point of eloquence.
Lewis and Short: Latin dictionary
perspĭcŭĭtas, ātis, f. [perspicuus], transparency, clearness.I.Lit.: vitrea perspicuitas, Plin. 37, 10, 54, 141; 37, 5, 20, 79.—II.Trop., evidentness, clearness, perspicuity: nihil est clarius e)nargei/a, perspicuitatem, aut evidentiam nos, si placet, nominemus, Cic. Ac. 2, 6, 17: perspicuitas argumentatione elevatur, id. N. D. 3, 4, 9: perspicuitas in verbis praecipuam habet proprietatem, Quint. 8, 2, 1.