Mid 17th century; earliest use found in Joseph Hall (1574–1656), bishop of Norwich, religious writer, and satirist. From millenary + -ism. Compare French millénarisme.
Definition of millenarism in US English:
millenarism
nounˈmɪlɪn(ə)rɪz(ə)m
Millenarianism.
Origin
Mid 17th century; earliest use found in Joseph Hall (1574–1656), bishop of Norwich, religious writer, and satirist. From millenary + -ism. Compare French millénarisme.