For Millennial we have a term and definition in Apocalypse.

Referring to a period of 1000 years, such as the end of the second Christian millennium in the year 2000. In religious terms, anything referring to the expected thousand-year reign of Christ on earth after the events of the last days have brought an end to this world. Such a radical transformation could come at any time, although expectations tend to increase at round markers such as the year 2000. Related to chiliasm, above.
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