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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

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Example Sentences

See Examples For:

def def.

"If you're looking for a mental break from the world def get Pokopia, it's like therapy," US-based influencer Ashley Duncan wrote on X.

From Barron's ● Mar. 11, 2026

In text overlaid on the clip, she promised: “This week I go off on the podcast.. def going to ruffle some feathers & I didn’t stutter.”

From Los Angeles Times ● Apr. 23, 2024

There’s an intimacy to a book that we can’t get from a movie or a TV show, no matter how true it is — even in 3-D, in the highest of high def.

From New York Times ● Apr. 27, 2023

“And we def have to catch up for drinks before you leave.”

From Washington Post ● Apr. 7, 2023

“Oh, yes! I want to def —” He ignored her outburst.

From "Gathering Blue" by Lois Lowry

Last year, for instance, The Guardian reported that it would soon be published in 140-word chunks “exclusively via Twitter,” with rewritten archival material, like “JFK assassin8d @ Dallas, def. heard second gunshot from grassy knoll.”

From New York Times ● Apr. 1, 2010

From kina, hina, originated the Icelandic and Swedish pastpositive def. article the; likewise Dak kin postpositive def. article the; ke emphatic pronoun kuns, clf, etc.

From The Dakotan Languages, and Their Relations to Other Languages by A. W. (Andrew Woods) Williamson

This follows from def. three; for each substance must be conceived in itself and through itself; in other words, the conception of one does not involve the conception of the other.

From Ancient and Modern Celebrated Freethinkers Reprinted From an English Work, Entitled "Half-Hours With The Freethinkers." by Charles Bradlaugh

For def. of recitative in vocal music, see p.

From Music Notation and Terminology by Karl Wilson Gehrkens

See the reply given by Plutarch, de def. orac.

From The Conflict of Religions in the Early Roman Empire by T. R. (Terrot Reaveley) Glover

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