def

¹

[ def ]

adverb

, Informal.

1. definitely:

   Going to Europe this summer? But def!

def

²

[ def ]

adjective

1. Slang. excellent:

   That hip-hop record is def!

def.

³

abbreviation for

1. defective.
2. defendant.
3. defense.
4. deferred.
5. defined.
6. definite.
7. definition.

def.

¹

abbreviation for

1. definition

def

²

/ dɛf /

adjective

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

Word History and Origins

Origin of def¹

By shortening

Origin of def²

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

Word History and Origins

Origin of def¹

C20: perhaps from definitive