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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

Example Sentences

Anthropic co-founder Jack Clark said the DEF CON event will hopefully be the start of a deeper commitment from AI developers to measure and evaluate the safety of the systems they are building.

From Washington Times • May 10, 2023

The Treasury believes it can make up for lost ground and in the DEF it raises its estimate for spending the EU funds in 2023 by 12 billion euros.

From Reuters • Sep. 29, 2022

Instead, Rumman Chowdhury — who leads machine learning ethics and responsibility at Twitter — presented them publicly at DEF CON and praised participants for helping to illustrate the real-world effects of algorithmic bias.

From The Verge • Nov. 19, 2021

DEFinitions: Report from Week 1238 In Week 1238 we continued three-letter abbreviating through the alphabet with some DEF, FED, EDF, etc., phrases.

From Washington Post • Aug. 24, 2017

DEF, is termed a “secant”; if it touches the circle, e.g.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" by Various