Etymology
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Satanism (n.)

1560s, "satanic disposition, the evil spirit characteristic of Satan," from Satan + -ism. Applied 1820s-30s to the poetry of Byron, etc. The older senses now are rare; the meaning "worship of Satan" dates from 1895, with reference to France, where it was said to be active at that time.

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Definitions of Satanism

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