QU0 WARRANTO. In old English practice. A writ, in the nature of a writ of right for the king, against him who claimed or usurped any office, franchise, or liberty, to inquire by what authority he supported his claim, in order to determine the right. It lay also in case of uon-user, or long neglect of a franchise, or misuser or abuse of it; being a writ commanding the defendant to show by what warrant he exercises such a franchise, having never had any grant of it, or having forfeited it by neglect or abuse. 3