Search Dictionary
Definition of def

def

/ˈdɛf/
def
JUMP TO:

def Lexical Profile

def Game Scores & Validity

• adverb

1

(informal, chiefly in text messaging and online communication) Definitely; certainly.

Example

"I will def be at the concert tonight if I finish my work on time."

Synonyms
View all synonyms for def
Antonyms
View all antonyms for def

• adjective

1

American (slang, originally hip-hop) Excellent, cool, or first-rate.

Example

"The DJ played some really def beats at the block party last night."

Synonyms
View all synonyms for def
Antonyms
View all antonyms for def

Word Nuance & Usage

Although pronounced identically to 'deaf', 'def' is a hip-hop slang term meaning excellent (or an informal clipping of 'definitely') and has no relation to hearing loss.

• Rhymes for def

• Nearby Words

deescalate
deescalation
deet
def
deface
defacement
defacer

Word Origin & Etymology

Emerged in 1970s and 1980s African American Vernacular English and hip-hop culture, likely as a clipping of 'definitive' or 'death' (used as an intensifier, as in 'done to death').

Cite this Entry

Wordmom. (2026). Definition of Def. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/def
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWords
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.