Search Dictionary
Definition of deffo

deffo

/ˈdɛf.əʊ/
def · fo
Adjective:definite
JUMP TO:

deffo Lexical Profile

deffo Game Scores & Validity

• adverb

1

British Without any doubt; definitely or certainly.

Example

"We are deffo going to the concert this weekend if we can get tickets."

Synonyms
View all synonyms for deffo
Antonyms
View all antonyms for deffo

• interjection

1

British Used as an emphatic affirmative response to express strong agreement or certainty.

Example

""Are you coming to the party tonight?" "Deffo!""

Synonyms
View all synonyms for deffo
Antonyms
View all antonyms for deffo

• Rhymes for deffo

• Nearby Words

deferrable
deferral
deferred
deffo
defiance
defiant
defiantly

Word Origin & Etymology

Coined in the late 20th century in British and Australian informal speech by clipping the adverb 'definitely' and adding the colloquial suffix '-o'.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Deffo. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/deffo
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.