Worship or reverence of devils; belief in or advocacy of devilish principles; devil worship.
From 'devil' plus the suffix '-ism' (from Greek -ismos, via Latin). The '-ism' suffix denotes beliefs, systems, or movements: Buddhism, communism, veganism.
The '-ism' suffix turns nouns into ideologies—it's how language allows us to package complex belief systems into single words. 'Devilism' shows how the suffix works, though the term is rare because devil worship isn't a formalized doctrine.
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