Lewis Short
quinquennÄum (noun N) : quinquennis
* A period of five years, five years (class.): CENSORES MAGISTRATVM QVINQVENNIVM HABENTO,Cic. Leg. 3, 3, 7: tria quinquennia,i. e. fifteen years,Ov. M. 4, 292: duo,id. ib. 12, 584.
Charlton T. Lewis, Charles Short, A Latin Dictionary