Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vīgintĭvĭrātus, ūs, m. [vigintiviri], the office of the vigintiviri, the vigintivirate; for the distribution of lands, Cic. Att. 9, 2, 1; Quint. 12, 1, 16 Spald.
Of the inferior civil court, Tac. A. 3, 29.
Of a municipal court, Inscr. Orell. 3970.