chiliasm
noun
chil·i·asm ˈki-lē-ˌa-zəm 
: millenarianism
chiliast
ˈki-lē-ˌast
noun -lē-əst
chiliastic
ˌki-lē-ˈa-stik
adjective 
Word History
Etymology
New Latin chiliasmus, from Late Latin chiliastes one that believes in chiliasm, from chilias
First Known Use
1610, in the meaning defined above