intrusion

/ɪnˈtɹuːʒən/

//ɪnˈtɹuːʒən// noun

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

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

The verdict

“intrusion” has 14 generated spelling variants in the English index at frequency #16,733. The variants make it a useful spelling check.

#16,733
frequency rank, English
17,902
“I” headwords
14
tracked misspellings
3
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The forcible inclusion or entry of an external group or individual; the act of intruding.

Visual similarity to commonly confused words

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

intrusion vs intrusive
78% similar
intrusion vs infusion
78% similar
intrusion vs inclusion
78% similar

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

Key facts for intrusion
PropertyValue
Headwordintrusion
LanguageEnglish
Part of speechNoun
IPA/ɪnˈtɹuːʒən/
Letters9
Frequency rank#16,733
Misspellings tracked14
Confusable pairs3
SourceWiktionary (kaikki.org)

Where “intrusion” 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). intrusion lands here:

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

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

A misspelling magnet

The generator records 14 spelling variants around intrusion (IPA /ɪnˈtɹuːʒən/), anoun. Corpus frequency is #16,733 among 17,902 “I” headwords. Wiktionary lists 5 senses, so context still picks the gloss.

Our generated misspelling index lists 14 likely wrong-spelling variants for intrusion, with forms such as "inntrusion", "inrtusion", and "intrrusion". 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 3 confusable-pair relationships, "intrusive", "infusion", "inclusion", where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Middle English intrusioun, from Old French intrusion, from Medieval Latin intrūsiō, from intrūdō, from Latin in- + trūdō. The correct English form is intrusion, spelled I-N-T-R-U-S-I-O-N.

Definition

  1. 1
    The forcible inclusion or entry of an external group or individual; the act of intruding.
  2. 2
    Magma forced into other rock formations; the rock formed when such magma solidifies.
  3. 3
    A structure that lies within a historic district but is nonhistoric and irrelevant to the district.
  4. 4
    The insertion of a phoneme into the pronunciation of a word despite its absence from the spelling. (e.g. intrusive r)
  5. 5
    An involuntarily arising idea or memory that is nuisant and falsifies an accurate impression of the world.

Etymology

From Middle English intrusioun, from Old French intrusion, from Medieval Latin intrūsiō, from intrūdō, from Latin in- + trūdō.

This word in other languages

intrusión(Español)intrusion(Français)Intrusion(Deutsch)intrusão(Português)

Common misspellings

Also misspelled as:

  • inntrusion
  • inrtusion
  • intrrusion
  • intrsuion
  • intruison
  • intrusino
  • intrusionn
  • intrusoin
  • intrussion
  • intrution
  • inttrusion
  • intursion
  • itnrusion
  • nitrusion

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of intrusion - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

inntrusion1inrtusion2intrrusion1intrsuion2intruison2intrusino2intrusionn1intrusoin2
Edit distance from "intrusion"

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 "intrusion"?
"intrusion" is spelled I-N-T-R-U-S-I-O-N. The IPA pronunciation is /ɪnˈtɹuːʒən/.
What does "intrusion" mean?
As a noun, "intrusion" means: The forcible inclusion or entry of an external group or individual; the act of intruding.
What words are commonly confused with "intrusion"?
"intrusion" is commonly confused with "intrusive", "infusion", "inclusion". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "intrusion"?
The IPA (International Phonetic Alphabet) transcription for "intrusion" is /ɪnˈtɹuːʒən/. 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 "intrusion"?
From Middle English intrusioun, from Old French intrusion, from Medieval Latin intrūsiō, from intrūdō, from Latin in- + trūdō. 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 “intrusion”

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

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

Same frequency band

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