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

One of its tracks, “Damascus,” features a lead vocal from Syrian singer Omar Souleyman alternating with rapping from Yasiin Bey, formerly known as Mos Def.

From The Wall Street Journal

So the majority of the people that I know I met through All Def.

From Los Angeles Times

The credits of the track mention Aubierre Rivaldo Taylor as the songwriter -- a name that only appears online in association with the group Def Beats AI, which is clearly identified as an AI project.

From Barron's

Def Leppard's Vivian Campbell has revealed while performing in certain parts of Northern Ireland during the Troubles he would "shut up" on stage.

From BBC

Campbell joined Def Leppard in the early 1990s.

From BBC