millennium

nouns

a span of 1000 years
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(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
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domain category
the collection of books of the Gospels, Acts of the Apostles, the Pauline and other epistles, and Revelation; composed soon after Christ's death; the second half of the Christian Bible
is a type of (narrower)
a belief (or system of beliefs) accepted as authoritative by some group or school
the 1000th anniversary (or the celebration of it)
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