1. People who believe in or advocate for millennialism, especially the Christian doctrine that Christ will reign on Earth for a thousand years.
Usage: plural form of millennialist; often used in religious or theological contexts
2. People who believe that a major transformation or utopian age will occur, often at a specific future date.
Usage: broader, non-religious usage

Examples

• Early Christian millennialists interpreted biblical prophecies as predicting Christ's thousand-year reign.
• Some millennialists expected significant social change at the turn of the millennium.
• Medieval millennialists often anticipated the end of the world based on apocalyptic texts.
• Modern millennialists continue to debate the timing and nature of prophesied events.
• Historians study millennialists to understand how religious beliefs shaped medieval and early modern societies.