I.a period of six years, six years: “puer subripitur Sexennio prius quam moritur pater,” Plaut. Poen. prol. 67: “tribuni plebis tulerunt de provinciis contra acta Caesaris, ille biennium, hi sexennium,” Cic. Phil. 5, 3, 7; so id. Div. 1, 44, 100; id. Att. 6, 1, 5.
sexennĭum , ii, n. sexennis,