Usurper

One who intrudes himself into an office which is vacant, and ousts the incumbent without any title or color whatever. His acts are void in every respect. Non usurpavit. L. He has not usurped: he is not exercising a franchise without authority. A plea to a quo warranto, that the defendant has a right to exercise the franchise, accompanied by a negation of the allegations of the writ, is not a plea of non usurpavit nor a disclaimer, but is a valid plea in such case. See Officer, De facto.