Source : Webster's Revised Unabridged Dictionary (1913)

Vigintivirate \Vi`gin*tiv"i*rate\, n. [L. vigintiviratus, fr.
   vigintiviri; viginti twenty + vir a man.]
   The office of the vigintiviri, a body of officers of
   government consisting of twenty men; also, the vigintiviri.
   [R.]