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Webster 1913 Edition

Demonianism

De-mo′ni-an-ism

,

Noun.

The state of being possessed by a demon or by demons.

Definition 2024

demonianism

demonianism

English

Noun

demonianism ‎(uncountable)

(now rare) Possession by a demon or demons.
- 1971, Keith Thomas, Religion and the Decline of Magic, Folio Society 2012, p. 458:
  Strictly speaking, the belief in demonianism was distinct from that in witchcraft.