# their

> English word · Determiner · IPA /ðɛə/ · frequency rank #56

## Definitions
1. Belonging to, from, of, or relating to, them (plural).
2. Belonging to someone (one person, singular), or occasionally to something.

## Etymology
From Old Norse þeirra. Replaced native Old English heora.

## Easily confused with
- **Thi** (https://plainspell.com/en/vs/their-vs-thi)
- **this** (https://plainspell.com/en/vs/their-vs-this)
- **they** (https://plainspell.com/en/vs/their-vs-they)
- **them** (https://plainspell.com/en/vs/their-vs-them)
- **then** (https://plainspell.com/en/vs/their-vs-then)
- **thin** (https://plainspell.com/en/vs/their-vs-thin)
- **tier** (https://plainspell.com/en/vs/their-vs-tier)
- **Thor** (https://plainspell.com/en/vs/their-vs-thor)
- **Theo** (https://plainspell.com/en/vs/their-vs-theo)
- **there** (https://plainspell.com/en/vs/their-vs-there)
- **these** (https://plainspell.com/en/vs/their-vs-these)
- **third** (https://plainspell.com/en/vs/their-vs-third)
- **theme** (https://plainspell.com/en/vs/their-vs-theme)
- **theta** (https://plainspell.com/en/vs/their-vs-theta)
- **Thier** (https://plainspell.com/en/vs/their-vs-thier)
- **theory** (https://plainspell.com/en/vs/their-vs-theory)
- **thesis** (https://plainspell.com/en/vs/their-vs-thesis)
- **theirs** (https://plainspell.com/en/vs/their-vs-theirs)
- **theism** (https://plainspell.com/en/vs/their-vs-theism)
- **they're** (https://plainspell.com/en/vs/their-vs-they-re)

## Common misspellings (6)
`hteir`, `tehir`, `theirr`, `theri`, `thheir`, `ttheir`

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