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definitions
  • synonyms

def1

[def]
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adverb Informal.
  1. definitely: Going to Europe this summer? But def!
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Origin of def1

by shortening

def2

[def]
adjective
  1. Slang. excellent: That hip-hop record is def!
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Origin of def2

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

def.

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
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Word Origin

C20: perhaps from definitive

def.

abbreviation for
  1. definition
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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.

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Online Etymology Dictionary, © 2010 Douglas Harper

def in Medicine

def

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

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