Slang. excellent: That hip-hop record is def!
Origin of def2
An Americanism dating back to 1980–85; of uncertain origin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
slang very good, esp of hip-hop
Word Origin for def
C20: perhaps from definitive
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
Online Etymology Dictionary, © 2010 Douglas Harper
decayed, extraction indicated due to caries, or filled (used for deciduous teeth)
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.