n. Properly, one who advocates anarchy or the absence of government as a political ideal; a believer in an anarchic theory of society; especially, an adherent of the social theory of Proudhon. See anarchy, 2.n. In popular use, one who seeks to overturn by violence all constituted forms and institutions of society and government, all law and order, and all rights of property, with no purpose of establishing any other system of order in the place of that destroyed; especially, such a person when actuated by mere lust of plunder.n. Any person who promotes disorder or excites revolt against an established rule, law, or custom. See anarch and nihilist.