# theirs

> English word · Pronoun · IPA /ðɛəz/ · frequency rank #7,623

## Definitions
1. That or those belonging to them; the possessive case of they, used without a following noun.
2. Their house or home.

## Etymology
From Middle English theires, attested since the 1300s. Equivalent to their + -s (compare -'s); formed by analogy to his. Displaced theirn (from Middle English theiren, formed by analogy to mine, thine) in standard speech.

## Easily confused with
- **this** (https://plainspell.com/en/vs/theirs-vs-this)
- **there** (https://plainspell.com/en/vs/theirs-vs-there)
- **third** (https://plainspell.com/en/vs/theirs-vs-third)
- **theory** (https://plainspell.com/en/vs/theirs-vs-theory)
- **thesis** (https://plainspell.com/en/vs/theirs-vs-thesis)
- **thirds** (https://plainspell.com/en/vs/theirs-vs-thirds)
- **theres** (https://plainspell.com/en/vs/theirs-vs-theres)
- **thirst** (https://plainspell.com/en/vs/theirs-vs-thirst)
- **theses** (https://plainspell.com/en/vs/theirs-vs-theses)
- **theism** (https://plainspell.com/en/vs/theirs-vs-theism)
- **their** (https://plainspell.com/en/vs/their-vs-theirs)
- **tears** (https://plainspell.com/en/vs/tears-vs-theirs)
- **Thais** (https://plainspell.com/en/vs/thais-vs-theirs)
- **Thebes** (https://plainspell.com/en/vs/thebes-vs-theirs)

## Common misspellings (9)
`hteirs`, `tehirs`, `theirrs`, `theirss`, `theisr`, `theris`, `thheirs`, `thiers`, `ttheirs`

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