Kalmar "chiliast" ta samo asali ne daga kalmar Helenanci "chilioi," ma'ana "dubu." Yana nufin wani mutum ko tsarin imani da ke da alaƙa da chiliasm, wanda shine koyaswar tauhidi ko ka'idar game da mulkin shekaru dubu na gaba na Kristi a duniya, sau da yawa ana kiransa "Millennium." Chiliasm yawanci yana da alaƙa da wasu fassarori na Littafin Ru'ya ta Yohanna da sauran annabce-annabce na Littafi Mai Tsarki. A cikin wannan mahallin, chilist shine wanda ke riƙe ko ya ba da shawara ga imani ga cikar zaman lafiya da adalci na tsawon shekaru dubu a duniya, yawanci yana bin zuwan Yesu Kiristi na biyu.