fusion

/ˈfjuː.ʒən/

//ˈfjuː.ʒən// noun

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

"fusion" is a 6-letter English headword indexed on PlainSpell.

The verdict

“fusion” is a regularly-used English word, ranked #6,911 in English word frequency and used as a noun.

#6,911
frequency rank, English
6
letters
9
tracked misspellings
6
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The act of merging separate things, or the result thereof.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

fusion vs futon
67% similar
fusion vs Fulton
50% similar
fusion vs fusing
67% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for fusion
PropertyValue
Headwordfusion
LanguageEnglish
Part of speechNoun
IPA/ˈfjuː.ʒən/
Letters6
Frequency rank#6,911
Misspellings tracked9
Confusable pairs6
SourceWiktionary (kaikki.org)

Where “fusion” sits in English frequency

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

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

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for fusion is 6 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈfjuː.ʒən/. Corpus data places it at rank #6,911 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 8 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 9 likely wrong-spelling variants for fusion, with forms such as "ffusion", "fsuion", and "fuison". 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. It also participates in 6 confusable-pair relationships, "futon", "Fulton", "fusing", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: First appears c. 1555, in a translation by Richard Eden. From Middle French fusion, from Latin fūsiōnem (the accusative of fūsiō), from fusus, past participle of fundō (“I pour, I melt”) (see also found). Doublet of foison. The correct English form is fusion, spelled F-U-S-I-O-N.

Definition

  1. 1
    The act of merging separate things, or the result thereof.
  2. 2
    The act of merging separate things, or the result thereof.
  3. 3
    The act of merging separate things, or the result thereof.
  4. 4
    The act of merging separate things, or the result thereof.
  5. 5
    The act of merging separate things, or the result thereof.
  6. 6
    The act of merging separate things, or the result thereof.
  7. 7
    The act of merging separate things, or the result thereof.
  8. 8
    The act of merging separate things, or the result thereof.

Etymology

First appears c. 1555, in a translation by Richard Eden. From Middle French fusion, from Latin fūsiōnem (the accusative of fūsiō), from fusus, past participle of fundō (“I pour, I melt”) (see also found). Doublet of foison.

Antonyms

fission

This word in other languages

derretimiento(Español)fusion(Français)Schmelzen(Deutsch)fusão(Português)

Common misspellings

Also misspelled as: ffusion,fsuion,fuison,fusino,fusionn,fusoin,fussion,fution,ufsion

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of fusion - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

ffusion1fsuion2fuison2fusino2fusionn1fusoin2fussion1fution1
Edit distance from "fusion"

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 "fusion"?
"fusion" is spelled F-U-S-I-O-N. The IPA pronunciation is /ˈfjuː.ʒən/.
What does "fusion" mean?
As a noun, "fusion" means: The act of merging separate things, or the result thereof.
What words are commonly confused with "fusion"?
"fusion" is commonly confused with "futon", "Fulton", "fusing". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "fusion"?
The IPA (International Phonetic Alphabet) transcription for "fusion" is /ˈfjuː.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 "fusion"?
First appears c. 1555, in a translation by Richard Eden. From Middle French fusion, from Latin fūsiōnem (the accusative of fūsiō), from fusus, past participle of fundō (“I pour, I melt”) (see also found). Doublet of foison. 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.

Using “fusion”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is F-U-S-I-O-N - every other letter order is a misspelling in standard orthography.
  • Say it as /ˈfjuː.ʒən/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “futon” - see the side-by-side comparison. fusion vs futon
  • Browse more English words and confusable pairs in the same reference. English words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

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

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list