diffusion

/dɪˈfjuː.ʒən/

//dɪˈfjuː.ʒən// noun

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

"diffusion" is a 9-letter English headword indexed on PlainSpell.

The verdict

“diffusion” has 12 generated spelling variants in the English index at frequency #17,120. The variants make it a useful spelling check.

#17,120
frequency rank, English
3,470
“D” headwords
12
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The act of diffusing or dispersing something, or the property of being diffused or dispersed; dispersion.

Corpus desk

Index EN-diffusion · diffusion · English

diffusion · rank #17,120 · 12 variants · 0 confusables

  • FREQ-MID #17,120
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-MID 12 variants
  • BOOK-MID 3,470
  • PHOTO-FINISH deviation

Nearest frequency peer: deviation (-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.

Rank peers near misspelling magnet “diffusion”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “diffusion” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for diffusion
PropertyValue
Headworddiffusion
LanguageEnglish
Part of speechNoun
IPA/dɪˈfjuː.ʒən/
Letters9
Frequency rank#17,120
Misspellings tracked12
Confusable pairs0
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “diffusion”

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

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

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “deviation” (#17,119), “dildo” (#17,121), “demos” (#17,118). Among 3,470 “D” headwords, “diffusion” is #17,120. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 12 spelling variants around diffusion (IPA /dɪˈfjuː.ʒən/), anoun. Corpus frequency is #17,120 among 3,470 “D” headwords. Wiktionary lists 7 senses, so context still picks the gloss.

Our generated misspelling index lists 12 likely wrong-spelling variants for diffusion, with forms such as "ddiffusion", "dfifusion", and "diffsuion". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. Our dataset records no confusable match here, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

Etymologically, the entry records: Borrowed from Latin diffūsiō, from diffundō; can be decomposed as diffuse + -ion. The correct English form is diffusion, spelled D-I-F-F-U-S-I-O-N.

Definition

  1. 1
    The act of diffusing or dispersing something, or the property of being diffused or dispersed; dispersion.
  2. 2
    The scattering of light by reflection from a rough surface, or by passage through a translucent medium.
  3. 3
    The intermingling of the molecules of a fluid due to random thermal agitation.
  4. 4
    The spread of cultural or linguistic practices, or social institutions, in one or more communities.
  5. 5
    The gradual spread and adoption of goods or services.
  6. 6
    Exchange of airborne media between regions in space in an apparently random motion of a small scale.
  7. 7
    The movement of water vapor from regions of high concentration (high water vapor pressure) toward regions of lower concentration.

Recorded use

Wiktionary examples

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

  1. gaseous diffusion
  2. Even the false-necked vase, though it reaches its widest diffusion at this epoch, is, as we have seen, a type found existing in much earlier strata.

Etymology

Borrowed from Latin diffūsiō, from diffundō; can be decomposed as diffuse + -ion.

This word in other languages

difusión(Español)diffusion(Français)Streuung(Deutsch)

Common misspellings

Also misspelled as:

  • ddiffusion
  • dfifusion
  • diffsuion
  • diffuison
  • diffusino
  • diffusionn
  • diffusoin
  • diffussion
  • diffution
  • difufsion
  • difusion
  • idffusion

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of diffusion - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

ddiffusion1dfifusion2diffsuion2diffuison2diffusino2diffusionn1diffusoin2diffussion1
Edit distance from "diffusion"

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 "diffusion"?
"diffusion" is spelled D-I-F-F-U-S-I-O-N. The IPA pronunciation is /dɪˈfjuː.ʒən/.
What does "diffusion" mean?
As a noun, "diffusion" means: The act of diffusing or dispersing something, or the property of being diffused or dispersed; dispersion.
What are common misspellings of "diffusion"?
Common misspellings include "ddiffusion", "dfifusion", "diffsuion", "diffuison", "diffusino". The correct spelling is "diffusion".
How do you pronounce "diffusion"?
The IPA (International Phonetic Alphabet) transcription for "diffusion" is /dɪˈfjuː.ʒən/. 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 "diffusion"?
Borrowed from Latin diffūsiō, from diffundō; can be decomposed as diffuse + -ion. 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 "diffusion", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 9 letters (nearest by frequency rank).

deviation#17,119condensed#17,108etiquette#17,132childcare#17,100

Similar misspelling depth

Headwords with a similar count of attested misspellings (12 here; floor ≥5).

daunting12 variantsconveyed12 variantsbourgeois12 variantshousewife12 variants

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

Source: FrequencyWords open word-frequency list