expansion

/ɪkˈspænʃən/

//ɪkˈspænʃən// noun

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

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

The verdict

“expansion” is a regularly-used English word, ranked #2,791 in English word frequency and used as a noun.

#2,791
frequency rank, English
9
letters
14
tracked misspellings
4
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - An act, process, or instance of expanding.

Visual similarity to commonly confused words

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

expansion vs extension
78% similar
expansion vs explosion
78% similar
expansion vs expulsion
78% similar

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

Key facts for expansion
PropertyValue
Headwordexpansion
LanguageEnglish
Part of speechNoun
IPA/ɪkˈspænʃən/
Letters9
Frequency rank#2,791
Misspellings tracked14
Confusable pairs4
SourceWiktionary (kaikki.org)

Where “expansion” 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). expansion 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 expansion is 9 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ɪkˈspænʃən/. Corpus data places it at rank #2,791 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 12 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 14 likely wrong-spelling variants for expansion, with forms such as "epxansion", "exapnsion", and "expanison". 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 4 confusable-pair relationships, "extension", "explosion", "expulsion", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: Borrowed from French expansion, from Latin expānsiō. By surface analysis, expand + -sion. The correct English form is expansion, spelled E-X-P-A-N-S-I-O-N.

Definition

  1. 1
    An act, process, or instance of expanding.
  2. 2
    An act, process, or instance of expanding.
  3. 3
    An act, process, or instance of expanding.
  4. 4
    An act, process, or instance of expanding.
  5. 5
    An act, process, or instance of expanding.
  6. 6
    An act, process, or instance of expanding.
  7. 7
    An act, process, or instance of expanding.
  8. 8
    An act, process, or instance of expanding.
  9. 9
    An act, process, or instance of expanding.
  10. 10
    An act, process, or instance of expanding.
  11. 11
    An act, process, or instance of expanding.
  12. 12
    An act, process, or instance of expanding.

Etymology

Borrowed from French expansion, from Latin expānsiō. By surface analysis, expand + -sion.

Antonyms

contractionshrinkage

This word in other languages

expansión(Español)expansion(Français)Expansion(Deutsch)expansão(Português)

Common misspellings

Also misspelled as: epxansion,exapnsion,expanison,expannsion,expansino,expansionn,expansoin,expanssion,expantion,expasnion,expnasion,exppansion,exxpansion,xepansion

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of expansion - 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.

epxansion2exapnsion2expanison2expannsion1expansino2expansionn1expansoin2expanssion1
Edit distance from "expansion"

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 "expansion"?
"expansion" is spelled E-X-P-A-N-S-I-O-N. The IPA pronunciation is /ɪkˈspænʃən/.
What does "expansion" mean?
As a noun, "expansion" means: An act, process, or instance of expanding.
What words are commonly confused with "expansion"?
"expansion" is commonly confused with "extension", "explosion", "expulsion". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "expansion"?
The IPA (International Phonetic Alphabet) transcription for "expansion" is /ɪkˈspænʃən/. 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 "expansion"?
Borrowed from French expansion, from Latin expānsiō. By surface analysis, expand + -sion. 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 “expansion”

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

  • The one correct English spelling is E-X-P-A-N-S-I-O-N - every other letter order is a misspelling in standard orthography.
  • Say it as /ɪkˈspænʃən/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “extension” - see the side-by-side comparison. expansion vs extension
  • 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