# intrusion

> English word · Noun · IPA /ɪnˈtɹuːʒən/ · frequency rank #16,733

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

## Easily confused with
- **intrusive** (https://plainspell.com/en/vs/intrusion-vs-intrusive)
- **infusion** (https://plainspell.com/en/vs/infusion-vs-intrusion)
- **inclusion** (https://plainspell.com/en/vs/inclusion-vs-intrusion)

## Common misspellings (14)
`inntrusion`, `inrtusion`, `intrrusion`, `intrsuion`, `intruison`, `intrusino`, `intrusionn`, `intrusoin`, `intrussion`, `intrution`, `inttrusion`, `intursion`, `itnrusion`, `nitrusion`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/intrusion