An obsessive preoccupation with demons, or a mental state characterized by excessive belief in or fear of demonic influence.
From demon + -mania (from Greek mania meaning 'frenzy' or 'obsession'). This term emerged in the 18th-19th centuries during medical discussions of what we might now call delusions or psychiatric conditions.
Medieval doctors literally diagnosed 'demonomania' in patients—what we'd recognize as mental illness or extreme anxiety—showing how deeply demonic explanations were woven into people's understanding of psychology itself.
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