- daemon (generally only in the senses of "inner spirit" and "divinity of Greek mythology")
- dæmon (old, no longer used)
- (countable)} A demon is an evil spirit.
- (countable) A demon is a fallen angel or satanic being; a false god.
- He said a demon appeared magically and told him to do these evil things.
- (countable) A demon is a person's inner spirit or genius, a daimon.
- (countable) A demon is a flaw in a person's character.
- The demon of stupidity haunts me whenever I open my mouth.