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Wordnet 3.0

NOUN (3)

1. an evil supernatural being;
[syn: devil, fiend, demon, daemon, daimon]

2. a cruel wicked and inhuman person;
[syn: monster, fiend, devil, demon, ogre]

3. someone extremely diligent or skillful;
- Example: "he worked like a demon to finish the job on time"
- Example: "she's a demon at math"


The Collaborative International Dictionary of English v.0.48:

Demon \De"mon\, n. [F. d['e]mon, L. daemon a spirit, an evil spirit, fr. Gr. dai`mwn a divinity; of uncertain origin.] 1. (Gr. Antiq.) A spirit, or immaterial being, holding a middle place between men and deities in pagan mythology. [1913 Webster] The demon kind is of an intermediate nature between the divine and the human. --Sydenham. [1913 Webster] 2. One's genius; a tutelary spirit or internal voice; as, the demon of Socrates. [Often written d[ae]mon.] [1913 Webster] 3. An evil spirit; a devil. [1913 Webster] That same demon that hath gulled thee thus. --Shak. [1913 Webster]
WordNet (r) 3.0 (2006):

demon n 1: an evil supernatural being [syn: devil, fiend, demon, daemon, daimon] 2: a cruel wicked and inhuman person [syn: monster, fiend, devil, demon, ogre] 3: someone extremely diligent or skillful; "he worked like a demon to finish the job on time"; "she's a demon at math"
Moby Thesaurus II by Grady Ward, 1.0:

123 Moby Thesaurus words for "demon": Baba Yaga, Lilith, Mafioso, Satan, Young Turk, addict, afreet, ape-man, atua, barghest, beast, beldam, berserk, berserker, bomber, brute, bug, cacodemon, collector, daemon, daeva, damned spirits, demonkind, demons, denizens of hell, devil, devil incarnate, dragon, dybbuk, eager beaver, energumen, enthusiast, evil genius, evil spirit, evil spirits, faddist, fanatic, fiend, fiend from hell, fire-eater, firebrand, freak, fury, genie, genius, ghoul, goon, gorilla, great one for, gunsel, gyre, hardnose, harpy, hell-raiser, hellcat, hellhound, hellion, hellish host, hellkite, hobbyist, holy terror, hood, hoodlum, host of hell, hothead, hotspur, hound, incendiary, incubus, infatuate, inhabitants of Pandemonium, intelligence, jinni, jinniyeh, killer, lamia, lost souls, mad dog, madcap, monster, mugger, nut, ogre, ogress, powers of darkness, pursuer, rakshasa, rapist, revolutionary, rhapsodist, satan, savage, she-wolf, shedu, souls in hell, specter, spirit, spitfire, succubus, sucker for, supernatural being, termagant, terror, terrorist, the damned, the lost, the undead, tiger, tigress, tough, tough guy, ugly customer, vampire, violent, virago, visionary, vixen, werewolf, wild beast, witch, wolf, yogini, zealot
Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "Demon": His Satanic Majesty, Lucifer, Satan, Satanas, the Adversary, the Arch-fiend, the Common Enemy, the Demon, the Devil, the Devil Incarnate, the Evil One, the Evil Spirit, the Fiend, the Foul Fiend, the Old Enemy, the Old Serpent, the Tempter, the Wicked One, the archenemy, the serpent
The Jargon File (version 4.4.7, 29 Dec 2003):

demon n. 1. Often used equivalently to daemon ? especially in the Unix world, where the latter spelling and pronunciation is considered mildly archaic. 2. [MIT; now probably obsolete] A portion of a program that is not invoked explicitly, but that lies dormant waiting for some condition(s) to occur. See daemon. The distinction is that demons are usually processes within a program, while daemons are usually programs running on an operating system. Demons in sense 2 are particularly common in AI programs. For example, a knowledge-manipulation program might implement inference rules as demons. Whenever a new piece of knowledge was added, various demons would activate (which demons depends on the particular piece of data) and would create additional pieces of knowledge by applying their respective inference rules to the original piece. These new pieces could in turn activate more demons as the inferences filtered down through chains of logic. Meanwhile, the main program could continue with whatever its primary task was.
The Free On-line Dictionary of Computing (18 March 2015):

demon 1. (Often used equivalently to daemon, especially in the Unix world, where the latter spelling and pronunciation is considered mildly archaic). A program or part of a program which is not invoked explicitly, but that lies dormant waiting for some condition(s) to occur. At MIT they use "demon" for part of a program and "daemon" for an operating system process. Demons (parts of programs) are particularly common in AI programs. For example, a knowledge-manipulation program might implement inference rules as demons. Whenever a new piece of knowledge was added, various demons would activate (which demons depends on the particular piece of data) and would create additional pieces of knowledge by applying their respective inference rules to the original piece. These new pieces could in turn activate more demons as the inferences filtered down through chains of logic. Meanwhile, the main program could continue with whatever its primary task was. This is similar to the triggers used in relational databases. The use of this term may derive from "Maxwell's Demons" - minute beings which can reverse the normal flow of heat from a hot body to a cold body by only allowing fast moving molecules to go from the cold body to the hot one and slow molecules from hot to cold. The solution to this apparent thermodynamic paradox is that the demons would require an external supply of energy to do their work and it is only in the absence of such a supply that heat must necessarily flow from hot to cold. Walt Bunch believes the term comes from the demons in Oliver Selfridge's paper "Pandemonium", MIT 1958, which was named after the capital of Hell in Milton's "Paradise Lost". Selfridge likened neural cells firing in response to input patterns to the chaos of millions of demons shrieking in Pandemonium. 2. Demon Internet Ltd. 3. A program generator for differential equation problems. [N.W. Bennett, Australian AEC Research Establishment, AAEC/E142, Aug 1965]. [Jargon File] (1998-09-04)
Easton's 1897 Bible Dictionary:

Demon See DAEMON.