Lewis Short
(adjective) : septŭāginta, for septumaginta, septem-decenta
* Seventy, Col. Arb. 4, 3: centum septuaginta,a hundred and seventy,Cic. Verr. 2, 3, 52, § 121: septuaginta et tres,Liv. 35, 1 fin.: septem et septuaginta annos,Nep. Att. 21, 1; cf. with numerals: interficiuntur IV. et LXX.,Caes. B. G. 4, 12.
Charlton T. Lewis, Charles Short, A Latin Dictionary