IPA: /ˌmɪləˈnɛəriənɪzəm/
KK: /mɪlɪˈnɛəriənɪzəm/
A belief that a significant transformation or ideal society will occur, often associated with religious or prophetic expectations.
Many groups throughout history have embraced millenarianism, anticipating a dramatic change in society.
Millenarianism is formed from "mille" (from Latin, meaning thousand) and "-arianism" (a suffix indicating a belief system or doctrine). The term refers to the belief in a coming thousand-year period of peace and prosperity, often associated with religious prophecy.
Think of 'mille' meaning thousand, and remember that millenarianism is the belief in a thousand-year period of peace.