penetration Copy link Outline 1. ăcies, ēi2. ăcūmen, ĭnis, n.3. săgācĭtas (keen-scentedness; keenness at finding out things) • penetration: 1. ăcies, ēi: with ingenii, mentis: cf. Cic. Ac. 2, 39, init., nulla a. ingenii tanta quae penetrare in coelum possit. 2. ăcūmen, ĭnis, n.: Cic. Nep.: v. acuteness. 3. săgācĭtas (keen-scentedness; keenness at finding out things): Cic. Phr.. a man of the greatest p., homo ingenio prudentiaque acutissimus, Cic. de Or. 1, 39, 180: he possessed remarkable p. in forecasting the future, de futuris callidissime conjiciebat, Nep. Them. 1, extr.