Noun
Character, action, or principles appropriate to the devil.
Possession by the devil.
Source: Webster's dictionaryAnyone in the Order found guilty of diabolism is expelled and hunted down. Source: Internet
In short, the witch became Satan's puppet."sfn This conception of witches was "part of a conception of magic that is termed by scholars as 'Satanism' or 'diabolism'". Source: Internet
Matthew Gregory Lewis 's lurid tale of monastic debauchery, black magic and diabolism entitled The Monk (1796) offered the first continental novel to follow the conventions of the Gothic novel. Source: Internet