Their is the correct spelling and is used to show ownership or possession. Thier is incorrect and not a valid English word. Always use their when something belongs to people.
Many people mistakenly write thier instead of their, especially while typing quickly. This spelling error is extremely common in emails, social media posts, school assignments, and professional writing. Since both words look very similar, writers often do not notice the mistake.
People search for “thier or their” to confirm which spelling is correct. The confusion happens because English spelling does not always follow clear pronunciation rules, and typing habits make errors easy to miss. Unfortunately, using thier instead of their can make writing look careless or unprofessional.
This article clearly explains the difference in a simple way. You will learn what their means, why thier is wrong, common mistakes, real-life examples, practice exercises with answers, and tips to remember the correct spelling every time.
Thier or Their Quick Answer
Their is correct.
Thier is incorrect.
Simple Explanation
- Their shows ownership.
- Thier is a spelling mistake.
Examples
- This is their house.
- Students forgot their books.
There is no situation where thier is correct.
Grammar Rules Explained
Their Meaning and Rule
Their is a possessive adjective.
It shows that something belongs to people.
It is used before a noun.
Examples
- Their car is parked outside.
- Their ideas are creative.
- Their teacher explained the lesson.
Thier Meaning and Rule
Thier has no meaning.
It is not a real English word.
It appears only due to spelling errors.
Examples
- Thier house is big. ❌
- Thier plans failed. ❌
Always replace thier with their.
Why People Make Mistakes With Thier or Their
Letter Order Confusion
The letters E and I are often mixed up while typing.
Fast Typing
When typing quickly, fingers hit the wrong keys.
Weak Spelling Awareness
Many writers rely on sound rather than spelling.
Autocorrect Misses Errors
Some tools do not always catch this mistake.
Informal Writing Habits
Texting and casual writing encourage careless spelling.
Thier or Their in Real Life Usage
Daily Conversation in Writing
- Their house is nearby.
- Their friends are visiting.
Emails
- Please submit their documents today.
- Their request has been approved.
Social Media
- Proud of their achievements.
- Their journey is inspiring.
Formal Writing
- Their responsibilities are clearly defined.
- Their contribution was significant.
Professional writing always uses their, never thier.
British and American English Usage
There is no difference between British and American English.
Both use:
- Their as the correct spelling
Thier is incorrect everywhere.
Examples
- UK: Their decision was final.
- US: Their decision was final.
Which One Should You Use
The answer is simple.
Always use their.
Never use thier.
Quick Check
If the word shows ownership, their is correct.
- Their bags are ready.
- Their opinion matters.
Common Mistakes and Corrections
Wrong: Thier house is beautiful.
Correct: Their house is beautiful.
Wrong: Students forgot thier books.
Correct: Students forgot their books.
Wrong: Thier plans changed suddenly.
Correct: Their plans changed suddenly.
Thier or Their in More Sentences
Simple Sentences
- Their dog is friendly.
- Their bags are heavy.
Medium Sentences
- Their team won the match.
- Their parents attended the meeting.
Formal Sentences
- Their performance exceeded expectations.
- Their proposal was accepted unanimously.
Related Confusing Words
Learning similar mistakes helps improve spelling.
- their or there
- your or you’re
- its or it’s
- then or than
- affect or effect
Among these, thier is purely a spelling error, not a word.
Practice Exercises
Fill in the Blanks
- This is ______ house.
Answer: their - Students completed ______ work.
Answer: their - ______ decision surprised everyone.
Answer: their - I met ______ parents yesterday.
Answer: their
Choose the Correct Word
- (Thier / Their) car is new.
Answer: Their - (Thier / Their) books are on the table.
Answer: Their - (Thier / Their) ideas were impressive.
Answer: Their - (Thier / Their) team played well.
Answer: Their
FAQs
Is thier a real word?
No, thier is not a real English word and is always incorrect.
What does their mean?
Their shows ownership or possession.
Can thier ever be correct?
No, it is always a spelling mistake.
Why do people type thier instead of their?
Because of fast typing and letter order confusion.
Is there any difference in US and UK spelling?
No, both use their.
How can I remember the correct spelling?
Remember that their contains the word heir, which relates to ownership.
Conclusion
The confusion between thier and their is simple to solve. Their is the correct spelling and shows possession. Thier is always incorrect and should never be used in English writing.
This mistake happens due to fast typing, weak spelling awareness, and informal writing habits. By paying attention and practicing examples, you can easily avoid this error.
Clear spelling improves writing quality, trust, and confidence. Once you remember that their is the only correct form, you will never make this mistake again.
James Anderson is a blogger at EchoWordss.com, dedicated to making vocabulary and synonyms simple and accessible. His insights help readers strengthen their language and communicate more effectively.
