If you are unsure about “thier or their,” the correct spelling is their. The word “thier” is a spelling mistake that happens when the letters “i” and “e” are reversed.
This error is extremely common in emails, school assignments, social media captions, and casual text messages. English spelling rules can feel inconsistent, especially with words that follow patterns like “i before e except after c.” This guide explains why “their” is correct, how to avoid writing “thier,” and how to separate “their” from similar words like “there” and “they’re.”
People often confuse these words because they sound alike but serve different grammar roles. If spelling mix-ups frustrate you, this breakdown will clear things up quickly.
Why “Thier” Is A Common Misspelling Of “Their”
“Their” is the correct spelling. “Thier” is incorrect because the letters are in the wrong order. The word follows the standard spelling pattern “ei,” not “ie.”
Many people type “thier” by accident because English contains several words that use “ie,” such as “piece” and “field.” Fast typing also increases the chance of reversing the letters.
Here are a few examples:
| Incorrect Usage | Correct Usage |
| Thier dog is friendly. | Their dog is friendly. |
| I liked thier new house. | I liked their new house. |
| Thier teacher called today. | Their teacher called today. |
This spelling mistake appears so often that spell-check tools usually flag it immediately. If spelling reversals trip you up regularly, guides on common English spelling mistakes can help you spot repeating patterns.
Another reason people write “thier” is because English spelling rules are not always predictable. Similar confusion happens with words like receive or recieve and definitely or definately.
How To Use “Their” Correctly In English Grammar
“Their” is a possessive determiner. It shows ownership or connection to a group of people or sometimes to one person in modern English.
You usually place “their” before a noun. The noun is the thing being owned or connected.
Examples:
- Their car is parked outside.
- The students forgot their backpacks.
- The neighbors painted their fence blue.
- Taylor said their appointment starts at noon.
Here is a quick grammar breakdown:
| Word | Grammar Role | Example |
| Their | Possessive determiner | Their office moved downtown. |
| There | Refers to place or existence | The keys are over there. |
| They’re | Contraction of “they are” | They’re running late. |
Writers sometimes confuse possessive words because English has many irregular patterns. Similar spelling confusion appears in articles about separate or seperate and which or wich.
Why “Their,” “There,” And “They’re” Are Frequently Mixed Up
These three words sound almost identical in spoken English. That makes them classic homophones, words that sound alike but carry different meanings.
The sections below explain how each word works so you can spot the difference faster while writing.
How “Their” Shows Ownership
“Their” shows possession. It answers the question: who owns it?
Examples:
- Their pizza arrived late.
- The kids packed their lunches.
- The employees updated their schedules.
A simple memory trick: “their” contains the word “heir,” which relates to ownership or inheritance.
How “There” Refers To Place Or Existence
“There” points to location or existence.
Examples:
- Put the boxes over there.
- There is a problem with the printer.
- We stayed there during summer vacation.
If the sentence talks about a place or starts with “there is” or “there are,” you probably need “there.”
Confusion between similar-looking words is common in English. Writers also struggle with pairs like bearable or bareable and occurred or occured.
How “They’re” Replaces “They Are”
“They’re” is simply a contraction of “they are.”
Examples:
- They’re heading to the game tonight.
- I think they’re ready.
- They’re excited about the concert.
A quick test works well here. Replace “they’re” with “they are.” If the sentence still makes sense, the contraction is correct.
Sentence Patterns That Help You Remember “Their”
Certain sentence structures make it easier to recognize when “their” belongs in your writing. Once you notice these patterns, spelling mistakes become less frequent.
Pay attention to the noun that follows “their.” That noun usually signals ownership.
Common sentence patterns:
- Their + noun
- Their + adjective + noun
- Their + plural noun
Examples:
| Pattern | Example Sentence |
| Their + noun | Their apartment is downtown. |
| Their + adjective + noun | Their new manager starts Monday. |
| Their + plural noun | Their shoes were left outside. |
Incorrect examples:
- Thier office is closed.
- Their going to the movies.
- Put the bags over their.
Correct versions:
- Their office is closed.
- They’re going to the movies.
- Put the bags over there.
Writers who struggle with repeated letter order often make similar mistakes with words like welcome or wellcome and occasion or occassion.
The Role Of “Their” In Singular And Gender-Neutral English
Modern English often uses “their” to refer to one person when gender is unknown or irrelevant. This usage appears in journalism, schools, workplaces, and major style guides across the United States.
Some people still expect singular subjects to match singular pronouns, but singular “their” has existed for centuries.
Examples:
- Every student should bring their ID.
- Someone left their phone on the table.
- Each customer received their receipt by email.
This structure avoids awkward phrasing like “his or her.” It also supports gender-neutral communication naturally.
Major US style guides, including AP Style and the Chicago Manual of Style, accept singular “their” in many situations.
Grammar modernization creates confusion for some writers, similar to spelling changes seen in words like transferred or transfered and opened or openned.
British And American English Rules For “Their” Spelling
The spelling “their” stays the same in both American English and British English. There is no UK version that changes the letter order.
That means:
- American English: their
- British English: their
- Incorrect in both: thier
This differs from words that have regional spelling changes, such as “color” and “colour.” The word “their” follows one standard spelling worldwide.
The mistake “thier” happens because of typing habits, not because of regional grammar rules.
English spelling inconsistencies confuse many writers. Similar problems appear in words like develop or develope and opening or openning.
Memory Tricks To Avoid Writing “Thier”
Spelling memory tricks work best when they are short and easy to recall during typing.
Here are several reliable ways to remember “their” correctly:
- “Their” follows the “ei” pattern.
- Think of the word “heir” inside “their,” which connects to ownership.
- Use the phrase: “Their things belong to them.”
- Read the sentence out loud before sending messages or emails.
Another useful method is comparing incorrect and correct spellings repeatedly:
| Wrong | Correct |
| Thier | Their |
| Recieve | Receive |
| Untill | Until |
Patterns matter in English spelling. Articles covering until or untill and prove or proove show how extra or reversed letters create frequent writing errors.
Common Writing Mistakes Related To “Their”
People often misuse “their” in three specific ways:
- Reversing the letters
- Confusing it with “there”
- Confusing it with “they’re”
Here are examples of each problem:
| Mistake Type | Incorrect | Correct |
| Letter reversal | Thier team won. | Their team won. |
| Wrong homophone | Their is a problem. | There is a problem. |
| Wrong contraction | Their coming soon. | They’re coming soon. |
Autocorrect tools catch many spelling issues, but they do not always catch grammar confusion. For example, “their” and “there” are both real words, so software may miss the mistake completely.
This is why proofreading still matters, especially in professional writing, school essays, resumes, and business emails.
If spelling patterns often cause problems, it also helps to review confusing word pairs like taught or tought, congratulations or congradulations, and label or lable.
Final Clarity On Thier Or Their
“Their” is the correct spelling. “Thier” is always incorrect in standard English.
The confusion usually happens because English contains many “ie” words, but “their” follows the “ei” spelling pattern instead. The key is remembering that “their” shows ownership, while “there” refers to place and “they’re” means “they are.”
Once you recognize those grammar roles, the difference becomes much easier to spot during writing and proofreading.
Common Questions About Thier Or Their
Which Is Correct: Thier Or Their?
“Their” is correct. “Thier” is a misspelling caused by reversing the letters “i” and “e.”
What Is The Meaning Of “Thier”?
“Thier” has no official meaning in English because it is not a correct word. People usually mean to write “their.”
Why Is “Their” Spelled That Way?
“Their” comes from historical English language development and follows the “ei” spelling pattern. English spelling rules are not always consistent.
Is It “Their So Cute” Or “They’re So Cute”?
“They’re so cute” is correct because “they’re” means “they are.”
Can “Their” Be Used For One Person?
Yes. Singular “their” is widely accepted in modern English when gender is unknown or nonbinary.
What Is Another Word People Use Instead Of “Their”?
Depending on the sentence, alternatives may include “his,” “her,” “its,” or “theirs.”
How Do You Know When To Use “Their” Or “There”?
Use “their” for ownership and “there” for place or existence.
