noun

• An evil supernatural spirit.
• An evil spirit resident in or working for Hell; a devil.
• (now chiefly historical) A false god or idol; a Satanic divinity.
• A very wicked or malevolent person; also (in weakened sense) a mischievous person, especially a child.
• A source (especially personified) of great evil or wickedness; a destructive feeling or character flaw.
• (in the plural) A person's fears or anxieties.
• A neutral supernatural spirit.
• A person's inner spirit or genius; a guiding or creative impulse.
• (Greek mythology) A tutelary deity or spirit intermediate between the major Olympian gods and mankind, especially a deified hero or the entity which supposedly guided Socrates, telling him what not to do.
• A spirit not considered to be inherently evil; a (non-Christian) deity or supernatural being.
• A hypothetical entity with special abilities postulated for the sake of a thought experiment in philosophy or physics.
• Someone with great strength, passion or skill for a particular activity, pursuit etc.; an enthusiast.
• (card games) A type of patience or solitaire (card game) played in the UK and/or US.
• Any of various hesperiid butterflies of the genera Notocrypta and Udaspes.
• (physics) Acronym of distinct electron motion particle: A quasiparticle, a type of massless neutral electron excitation associated with superconductivity.
• (computing) Alternative spelling of daemon [An idea depicted as an entity.]
• Alternative letter-case form of demon (“card game”) [An evil supernatural spirit.]