• WordNet 3.6
    • adj millennian relating to a millennium or span of a thousand years
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Century Dictionary and Cyclopedia
    • millennian Same as millennial.
    • n millennian A millennialist.
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In literature:

Abundantly able though he was to refute the Millennians point by point he deliberately foregoes that method of attack.
"The Transformation of Early Christianity from an Eschatological to a Socialized Movement" by Lyford Paterson Edwards