Etymology
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diabolism (n.)

"actions or influence of the Devil; conduct worthy of the Devil," 1610s, from Ecclesiastical Greek diabolos "devil" (see devil (n.)) + -ism.

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Definitions of diabolism

diabolism (n.)
a belief in and reverence for devils (especially Satan);
Synonyms: demonism / Satanism
From wordnet.princeton.edu