The Collaborative International Dictionary of English v.0.48:

Chiliastic \Chili*astic\, a.
   Millenarian. "The obstruction offered by the chiliastic
   errors." --J. A. Alexander.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chiliastic
    adj 1: relating to or believing in the millennium of peace and
           happiness [syn: millenarian, chiliastic]