dīˈabəˌlizəm noun
( -s )
Etymology: diabol- + -ism
1.
a. : dealings with the devil : demonic possession : sorcery
conducting experiments in diabolism
b. : action or practice instigated or aided by the devil
diabolism was rampant in the universe — Carl Van Doren
c. : evil conduct or intent : evil
deeds of black misunderstanding rather than diabolism — Newsweek
2. : belief in or doctrine concerning devils ; especially : a religious doctrine or a perversion of religious doctrine involving the worship of devils