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In page Millennialism:

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Millennial social movements, a specific form of millenarianism, have as their basis some concept of a cycle of one-thousand years. Sometimes the two terms are used as synonyms, but purists regard this as not entirely accurate.[citation needed] Millennial social movements need not have a religious foundation, but they must have a vision of an apocalypse that can be utopian or dystopian. Those associated with millennial social movements are "prone to [be violent]",[1] with certain types of millennialism connected to violence.[2]