an evil spirit; devil or fiend.
an evil passion or influence.
a person considered extremely wicked, evil, or cruel.
a person with great energy, drive, etc.: He's a demon for work.
a person, especially a child, who is very mischievous: His younger son is a real little demon.
Australian Slang. a policeman, especially a detective.
of, pertaining to, characteristic of, or noting a demon.
possessed or controlled by a demon.

1350–1400; Middle English < Latin daemonium < Greek daimónion, thing of divine nature (in Jewish and Christian writers, evil spirit), neuter of daimónios, derivative of daímōn; (def 6) < Latin; see daemon Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
demon (ˈdiːmən)
1.  an evil spirit or devil
2.  a person, habit, obsession, etc, thought of as evil, cruel, or persistently tormenting
3.  daemon, Also called: daimon an attendant or ministering spirit; genius: the demon of inspiration
4.  a.  a person who is extremely skilful in, energetic at, or devoted to a given activity, esp a sport: a demon at cycling
 b.  (as modifier): a demon cyclist
5.  a variant spelling of daemon
6.  informal, archaic (Austral), (NZ) a detective or policeman
7.  computing a part of a computer program, such as a help facility, that can run in the background behind the current task or application, and which will only begin to work when certain conditions are met or when it is specifically invoked
[C15: from Latin daemōn evil spirit, spirit, from Greek daimōn spirit, deity, fate; see daemon]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from L. dæmon "spirit," from Gk. daimon (gen. daimonos) "lesser god, guiding spirit, tutelary deity," (sometimes including souls of the dead), used (with daimonion) in Christian Gk. translations and Vulgate for "god of the heathen" and "unclean spirit." Jewish authors earlier had employed
the Gk. word in this sense, using it to render shedim "lords, idols" in the Septuagint, and Matt. viii.31 has daimones, translated as deofol in O.E., feend or deuil in M.E. The original mythological sense is sometimes written dæmon for purposes of distinction. The Demon of Socrates (late 14c.) was a daimonion, a "divine principle or inward oracle." His accusers, and later the Church Fathers, however, represented this otherwise. Fem. form demoness first attested 1630s. The Demon Star (1895) is Algol.
Online Etymology Dictionary, © 2010 Douglas Harper
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Bible Dictionary

Demon definition


Easton's 1897 Bible Dictionary
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Example sentences
Decorated with polychrome paint, the brick's sides depict deities and demons.
They faith-heal the sick by clutching the ailing area of the body and praying
  silently to the heavens, casting out demons.
Monsters and madmen, ghosts and goblins, demons and disease.
Afraid that the demons may inhabit them if they stay so still for a moment.
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