their's

pron

By · According to Wiktionary data (CC BY-SA) ·

"their-s" is a 6-letter English headword indexed on PlainSpell.

The verdict

“their's” is uncommon English (frequency #91,066 among 3,151 “T” headwords), classed as a pronoun. The kind of spelling people second-guess.

#91,066
frequency rank, English
3,151
“T” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Obsolete form of theirs.

Corpus desk

Index EN-their-s · their's · English

their's · rank #91,066 · 0 variants · 0 confusables

  • FREQ-RARE #91,066
  • LEN-LONG 7 letters
  • VOW-2 2 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 3,151
  • PHOTO-FINISH THAAD

Nearest frequency peer: THAAD (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Long-tail ranks near “their's”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “their's” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for their's
PropertyValue
Headwordtheir's
LanguageEnglish
Part of speechPronoun
Letters7
Frequency rank#91,066
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “their's” in English

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).their'sfalls in this rarity band:

#1#100#1K#10K#100K
← used constantlyrarely used →

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Rare peers in the same band: “THAAD” (#91,065), “Thomaston” (#91,067), “tawhid” (#91,063). Among 3,151 “T” headwords, “their's” is #91,066. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

their's is uncommon English at frequency #91,066 among 3,151 “T” headwords, classed as apronoun. Rarity is why readers land here mid-draft. 2 senses are on record.

The misspelling generator found no plausible variants for their's, typically a sign the spelling maps closely to how the word sounds. This entry stands alone in our confusable dataset, since no other headword is close enough in sound or shape to pair with it.

This entry carries no recorded etymology, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is their's, spelled T-H-E-I-R-'-S.

Definition

  1. 1
    Obsolete form of theirs.
  2. 2
    Misspelling of theirs.

Recorded use

Wiktionary examples

These source excerpts show how their's appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. Colonel Middleton was dismounted amongst the king's forces, of whom one, taking him for a commander of their's, mounted him again, and bid him make haste, and kill a roundhead; and so he escaped.
  2. “Forward, the Light Brigade!” / Was there a man dismay’d? / Not tho’ the soldier knew / Some one had blunder’d: / Their’s not to make reply, / Their’s not to reason why, / Their’s but to do and die, / Into the valley of Death / Rode the six hundred.

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "their's"?
"their's" is spelled T-H-E-I-R-'-S.
What does "their's" mean?
As a pronoun, "their's" means: Obsolete form of theirs.
What language does "their's" come from?
"their's" is a English word. PlainSpell covers definitions, pronunciations, and spelling data across English, Spanish, Portuguese, French, and German.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "their's", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 7 letters (nearest by frequency rank).

tamping#91,062Tlingit#91,072Swanage#91,049sunroom#91,044

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list