[ dee-muhn ]
See synonyms for demon on
  1. an evil spirit; devil or fiend.

  2. an evil passion or influence.

  1. a person considered extremely wicked, evil, or cruel.

  2. a person with great energy, drive, etc.: He's a demon for work.

  3. a person, especially a child, who is very mischievous: His younger son is a real little demon.

  4. Australian Slang. a policeman, especially a detective.

  1. of, pertaining to, characteristic of, or noting a demon.

  2. possessed or controlled by a demon.

Origin of 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

Other definitions for demon- (2 of 2)


  1. variant of demono- before a vowel: demonism. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use demon in a sentence

British Dictionary definitions for demon


/ (ˈdiːmən) /

  1. an evil spirit or devil

  2. a person, habit, obsession, etc, thought of as evil, cruel, or persistently tormenting

  1. Also called: daemon, daimon an attendant or ministering spirit; genius: the demon of inspiration

    • a person who is extremely skilful in, energetic at, or devoted to a given activity, esp a sport: a demon at cycling

    • (as modifier): a demon cyclist

  2. a variant spelling of daemon (def. 1)

  3. Australian and NZ informal, archaic a detective or policeman

  4. 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

Origin of demon

C15: from Latin daemōn evil spirit, spirit, from Greek daimōn spirit, deity, fate; see daemon

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012