Lat. In Roman law. The form of words by which a vote in favor of a proposed law was orally expressed. Uti rogas, rolo vel jubeo, as you ask, I will or order; I vote as you propose; I am for the law. The letters “U. R.” on a ballot ex-pressed the same sentiment. Adams, Rom. Ant. 98, 100
Source: Black's Law Dictionary 2nd Ed (1910)