The practice, beliefs, or system of a cult; the state of being devoted to or organized around a cult.
From 'cult' plus '-ism' suffix, developed in the 19th-20th centuries. Describes both the organized religion itself and the broader phenomenon of cultic organization and belief.
The '-ism' suffix transforms 'cult' from just a group into a whole *system of thinking*—'cultism' captures how cults operate as complete worldviews that remake followers' minds!
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