# semi

> English word · Noun · IPA /ˈsɛmi/ · frequency rank #2,965

## Definitions
1. A semi-detached house.
2. A semi-trailer; a tractor-trailer; an eighteen-wheeler; an artic.
3. A semifinal.
4. A partial erection of the penis.
5. A semiautomatic firearm.
6. Semiconductor companies or positions in the stock market.
7. An intermediate in the production of end-use goods.

## Etymology
The prefix semi- (from Latin) used as a noun.

## Easily confused with
- **SI** (https://plainspell.com/en/vs/semi-vs-si)
- **SM** (https://plainspell.com/en/vs/semi-vs-sm)
- **set** (https://plainspell.com/en/vs/semi-vs-set)
- **sex** (https://plainspell.com/en/vs/semi-vs-sex)
- **sum** (https://plainspell.com/en/vs/semi-vs-sum)
- **ski** (https://plainspell.com/en/vs/semi-vs-ski)
- **sen** (https://plainspell.com/en/vs/semi-vs-sen)
- **SEO** (https://plainspell.com/en/vs/semi-vs-seo)
- **SEP** (https://plainspell.com/en/vs/semi-vs-sep)
- **SIM** (https://plainspell.com/en/vs/semi-vs-sim)
- **SMS** (https://plainspell.com/en/vs/semi-vs-sms)
- **SMH** (https://plainspell.com/en/vs/semi-vs-smh)
- **ser** (https://plainspell.com/en/vs/semi-vs-ser)
- **shi** (https://plainspell.com/en/vs/semi-vs-shi)
- **sew** (https://plainspell.com/en/vs/semi-vs-sew)
- **ses** (https://plainspell.com/en/vs/semi-vs-ses)
- **som** (https://plainspell.com/en/vs/semi-vs-som)
- **SEQ** (https://plainspell.com/en/vs/semi-vs-seq)
- **STI** (https://plainspell.com/en/vs/semi-vs-sti)
- **SME** (https://plainspell.com/en/vs/semi-vs-sme)

## Common misspellings (5)
`esmi`, `seim`, `semmi`, `smei`, `ssemi`

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