Lewis & Short

quattŭorvĭrātus (quat-), ūs, m. [quattuorviri], the office of the quattuorviri (class.), Asin. ap. Cic. Fam. 10, 32, 2.
Abbreviated: ĪĪĪĪ VIR., Inscr. Marin. Fratr. Arv. p. 402.