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definitions
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def1

[def]
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adverb Informal.
  1. definitely: Going to Europe this summer? But def!

Origin of def1

by shortening

def2

[def]
adjective
  1. Slang. excellent: That hip-hop record is def!

Origin of def2

An Americanism dating back to 1980–85; of uncertain origin

def.

  1. defective.
  2. defendant.
  3. defense.
  4. deferred.
  5. defined.
  6. definite.
  7. definition.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for def

def

adjective
  1. slang very good, esp of hip-hop

Word Origin

C20: perhaps from definitive

def.

abbreviation for
  1. definition
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

Word Origin and History for def

adj.

"excellent," first recorded 1979 in Black English, perhaps a shortened form of definite, or from a Jamaican variant of death.

Online Etymology Dictionary, © 2010 Douglas Harper

def in Medicine

def

abbr.
  1. decayed, extraction indicated due to caries, or filled (used for deciduous teeth)

DEF

abbr.
  1. decayed, extraction indicated due to caries, or filled (used for permanent teeth)
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.