/dee"meuhn/ , n.
1. an evil spirit; devil or fiend.
2. an evil passion or influence.
3. a person considered extremely wicked, evil, or cruel.
4. a person with great energy, drive, etc.: He's a demon for work.
5. a person, esp. a child, who is very mischievous: His younger son is a real little demon.
6. daemon.
7. Australian Slang. a policeman, esp. a detective.
adj.
8. of, pertaining to, characteristic of, or noting a demon.
9. possessed or controlled by a demon.
[ 1350-1400; ME daemonium daimónion, thing of divine nature (in Jewish and Christian writers, evil spirit), neut. of daimónios, deriv. of daímon; (def. 6) ]