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• def
  def

  adverb

  definitely.
• def.
  def.

  abbreviation

  defective.

def

¹ American  

[def] / dɛf /

adverb

Informal.

1. definitely.

   Going to Europe this summer? But def!

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def ² American  

[def] / dɛf /

adjective

1. Slang. excellent.

   That hip-hop record is def!

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def. ³ American  

abbreviation

1. defective.

2. defendant.

3. defense.

4. deferred.

5. defined.

6. definite.

7. definition.

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def. ¹ British  

abbreviation

1. definition

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def ² British  

/ dɛf /

adjective

1. slang very good, esp of hip-hop

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Etymology

Origin of def¹

By shortening

Origin of def²

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