Millenarianism, from Latin mīllēnārius "containing a thousand", is the belief by a religious, social, or political group or movement in a coming fundamental transformation of society, after which "all things will be changed".

What is the definition of the term millenarian?

(Entry 1 of 2) 1a : of or relating to belief in a millennium. b : apocalyptic sense 2. 2 : of or relating to 1000 years.

What is millennialism in Christianity?

Millennialism is the belief that there will be a period of peace and righteousness on the earth associated with the Second Coming of Christ. Millennialism has taken various forms and been embraced with varying degrees of intensity throughout the history of Christianity.