Look up: def

1. Def
   Really good, (derived from 'death'). In its day it had as much use in the hip-hop scene as in the graffiti scene. Not in use as much anymore, in some circles its use is considered downright cheesy. I'm all for bringing it back.
   Found on http://www.graffiti.org/faq/graffiti.glo
   
   
2. DEF
   Desktop Functional Equivalent [Compaq]
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
3. def
   an element of a message handling service(MHS)enabling an originating user agent(UA)to instruct the message transfer service(MTS)that a message being submitted shall be delivered no sooner than a specified date and time Category: Automation (includes telecommunications and computers)
   Found on http://www.mijnwoordenboek.nl/definition
   
   
4. def
   <abbreviation> Decayed, extracted, and filled tooth. ... See: def caries index. ... (05 Mar 2000) ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
5. DEF
   decayed/extraction/filled; see DEF rate.
   Found on http://www.encyclo.co.uk/local/21001
   
   
6. Def
   Def is hip-hop slang for very good, excellent.
   Found on http://www.probertencyclopaedia.com/brow
   
   
7. Def
   Def is hip-hop slang for very good, excellent.
   Found on http://www.probertencyclopaedia.com/brow
   
   
8. def
   Type: Abbreviation Pronunciation: def Definitions: 1. Abbreviation for decayed, extracted, or filled (deciduous teeth). See: def caries index
   Found on http://www.medilexicon.com/medicaldictio
   
   
9. DEF
   Type: Abbreviation Definitions: 1. Abbreviation for decayed, extracted, or filled (permanent teeth).
   Found on http://www.medilexicon.com/medicaldictio
   
   
10. def
    Definitely
    Found on http://www.netlingo.com/acronyms.php
    
    
11. Def
    [Naval Acronyms and Slang] Defence
    Found on http://www.hmforces.co.uk/Join_The_Force