Source : Webster's Revised Unabridged Dictionary (1913)

Chiliast \Chil"i*ast\, n. [Gr. ?. See {Chiliasm}.]
   One who believes in the second coming of Christ to reign on
   earth a thousand years; a milllenarian.

Source : WordNet®

chiliast
     n : a person who believes in the coming of the millennium (a
         time of great peace and prosperity) [syn: {millenarian},
         {millenarist}]