MILLENNIUM :  n 1: a span of 1000 years 2: (New Testament) in Revelations it is foretold that those faithful to Jesus will reign with Jesus over the earth for a thousand years; the meaning of these words have been much debated; some denominations (e.g. Jehovah's Witnesses) expect it to be a thousand years of justice and peace and happiness 3: the 1000th anniversary (or the celebration of it)

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MILLENNIUM : \Mil*len"ni*um\ (m[i^]l*l[e^]n"n[i^]*[u^]m), n. [LL., fr. L. mille a thousand + annus a year. See Mile, and Annual.] 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.

MILLENNIUM :  a thousand years; the name given to the era mentioned in Rev. 20:1-7. Some maintain that Christ will personally appear on earth for the purpose of establishing his kingdom at the beginning of this millennium. Those holding this view are usually called "millenarians." On the other hand, it is maintained, more in accordance with the teaching of Scripture, we think, that Christ's second advent will not be premillennial, and that the right conception of the prospects and destiny of his kingdom is that which is taught, e.g., in the parables of the leaven and the mustard-seed. The triumph of the gospel, it is held, must be looked for by the wider and more efficient operation of the very forces that are now at work in extending the gospel; and that Christ will only come again at the close of this dispensation to judge the world at the "last day." The millennium will thus precede his coming.