Dictionary.com
definitions
  • synonyms

def

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

Origin of def

1
by shortening

def

2
[def]
adjective
  1. Slang. excellent: That hip-hop record is def!
Show More

Origin of def

2
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

Examples from the Web for def

Contemporary Examples of def

Historical Examples of def


British Dictionary definitions for def

def

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

Word Origin for def

C20: perhaps from definitive

def.

abbreviation for
  1. definition
Show More
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.

Show More
Online Etymology Dictionary, © 2010 Douglas Harper

def in Medicine

def

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

DEF

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