Millennialist :: Millennialist (n.) One who believes that Christ will reign personally on earth a thousand years; a Chiliast; also, a believer in the universal prevalence of Christianity for a long period..
Millenniarism :: Millenniarism (n.) Belief in, or expectation of, the millennium; millenarianism..
Millennist :: Millennist (n.) One who believes in the millennium.
Millennium :: Millennium (n.) A thousand years; especially, the thousand years mentioned in the twentieth chapter in the twentieth chapter of Revelation, during which holiness is to be triumphant throughout the world. Some believe that, during this period, Christ will reign on earth in person with his saints..