deffo

/ˈdɛfəʊ/

//ˈdɛfəʊ// adj

By · According to Wiktionary data (CC BY-SA) ·

"deffo" is a 5-letter English headword indexed on PlainSpell.

The verdict

“deffo” is uncommon English (frequency #85,161 among 3,470 “D” headwords), classed as an adjective. The kind of spelling people second-guess.

#85,161
frequency rank, English
3,470
“D” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Definite.

Corpus desk

Index EN-deffo · deffo · English

deffo · rank #85,161 · 0 variants · 0 confusables

  • FREQ-RARE #85,161
  • LEN-MID 5 letters
  • VOW-2 2 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 3,470
  • PHOTO-FINISH Deimos

Nearest frequency peer: Deimos (+1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Long-tail ranks near “deffo”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “deffo” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for deffo
PropertyValue
Headworddeffo
LanguageEnglish
Part of speechAdjective
IPA/ˈdɛfəʊ/
Letters5
Frequency rank#85,161
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “deffo” in English

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).deffofalls in this rarity band:

#1#100#1K#10K#100K
← used constantlyrarely used →

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Rare peers in the same band: “Deimos” (#85,162), “declarer” (#85,159), “decennial” (#85,158). Among 3,470 “D” headwords, “deffo” is #85,161. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

deffo is uncommon English at frequency #85,161 among 3,470 “D” headwords, classed as anadjective, transcribed /ˈdɛfəʊ/. Rarity is why readers land here mid-draft. Gloss: "Definite.".

No generated misspelling entries exist for deffo in our index, a straightforward case of a spelling with little room for common typos. No close-neighbour confusable shows up for this headword in our dataset, which tends to mean the word is visually distinctive enough to stand on its own.

Etymologically, the entry records: From definitely or definite + -o (diminutive suffix). The correct English form is deffo, spelled D-E-F-F-O.

Definition

  1. 1
    Definite.

Recorded use

Wiktionary examples

These source excerpts show how deffo appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. I know for certain they′re not speaking to each other, that′s for deffo, not that I′ve even seen them in the same room over the last week to confirm their silence.
  2. ‘An infection. Nothing serious. They′ll have some colour in them soon, for deffo.’

Etymology

From definitely or definite + -o (diminutive suffix).

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "deffo"?
"deffo" is spelled D-E-F-F-O. The IPA pronunciation is /ˈdɛfəʊ/.
What does "deffo" mean?
As an adjective, "deffo" means: Definite.
How do you pronounce "deffo"?
The IPA (International Phonetic Alphabet) transcription for "deffo" is /ˈdɛfəʊ/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "deffo"?
From definitely or definite + -o (diminutive suffix). See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "deffo", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 5 letters (nearest by frequency rank).

diene#85,173culex#85,144Emmie#85,216Celle#85,100

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list