MILLENARIAN
millenarian, chiliastic
(adjective) relating to or believing in the millennium of peace and happiness
millenarian, millenarist, chiliast
(noun) a person who believes in the coming of the millennium (a time of great peace and prosperity)
Source: WordNet® 3.1
Etymology
Adjective
millenarian (comparative more millenarian, superlative most millenarian)
(Christianity) Pertaining to the belief in an impending period of one thousand years of peace and righteousness associated with the Second Coming of Christ. [from 17th c.]
Pertaining to any of various religious or social movements which believe in a coming radical change to existing world order; utopian, apocalyptic. [from 20th c.]
Lasting or expected to last a thousand years.
Noun
millenarian (plural millenarians)
A person who believes in an apocalyptic millennium, an Adventist.
Source: Wiktionary
Mil`le*na"ri*an, a. Etym: [See Millenary.]
Definition: Consisting of a thousand years; of or pertaining to the
millennium, or to the Millenarians.
Mil`le*na"ri*an, n.
Definition: One who believes that Christ will personally reign on earth a
thousand years; a Chiliast.
Source: Webster’s Unabridged Dictionary 1913 Edition