the GNU version of the Collaborative International Dictionary of English
n. The belief in demons or false gods.
The Century Dictionary and Cyclopedia
n. Belief in the existence of demons; character or action like that of demons.
n. Specifically, in anthropology, the belief in the existence of an intimate relation between a person and one or more supernatural beings who become his protectors and helpers.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a belief in and reverence for devils (especially Satan)
Word Usage
"While the threat of demonism is used to bring fear to the film’s characters, the genuine demonic behavior of everyday life (jealousy, violence, self-pity and war) offers the most brutal horror of this classic production."