# STI

> English word · Noun · frequency rank #26,266

## Definitions
1. Initialism of sexually transmitted infection (also S.T.I.).
2. Initialism of sexually transmitted illness.

## Easily confused with
- **su** (https://plainspell.com/en/vs/sti-vs-su)
- **SW** (https://plainspell.com/en/vs/sti-vs-sw)
- **SV** (https://plainspell.com/en/vs/sti-vs-sv)
- **Sy** (https://plainspell.com/en/vs/sti-vs-sy)
- **sun** (https://plainspell.com/en/vs/sti-vs-sun)
- **sub** (https://plainspell.com/en/vs/sti-vs-sub)
- **sum** (https://plainspell.com/en/vs/sti-vs-sum)
- **sue** (https://plainspell.com/en/vs/sti-vs-sue)
- **SUV** (https://plainspell.com/en/vs/sti-vs-suv)
- **sup** (https://plainspell.com/en/vs/sti-vs-sup)
- **STR** (https://plainspell.com/en/vs/sti-vs-str)
- **STS** (https://plainspell.com/en/vs/sti-vs-sts)
- **Stu** (https://plainspell.com/en/vs/sti-vs-stu)
- **Syd** (https://plainspell.com/en/vs/sti-vs-syd)
- **Sus** (https://plainspell.com/en/vs/sti-vs-sus)
- **Sui** (https://plainspell.com/en/vs/sti-vs-sui)
- **syn** (https://plainspell.com/en/vs/sti-vs-syn)
- **suh** (https://plainspell.com/en/vs/sti-vs-suh)
- **Sul** (https://plainspell.com/en/vs/sti-vs-sul)
- **sud** (https://plainspell.com/en/vs/sti-vs-sud)

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