American Dictionary

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Definition their in American English

their determiner

determiner
/ðer/

Their is used as a possessive determiner (followed by a noun), being a possessive form of they.

Don’t confuse their (the possessive form of “they”) and there (a pronoun and adverb). These two words sound exactly the same.

✗ In a democracy, people have the power to decide there own future.

✓ In a democracy, people have the power to decide their own future.

✗ Most women didn’t work and were dependent on there husbands.

✓ Most women didn’t work and were dependent on their husbands.

1

belonging to or relating to a particular group of people or things that have already been mentioned or when it is obvious which ones you are referring to

Example

Workers are afraid that they will lose their jobs.

Example

She has made a study of chemical fertilizers and their effect on the environment.

Example

They have children of their own.

Synonyms and related words
2

used instead of "his or her," especially when you are referring back to a word such as "everyone," "someone," or "anyone. Many people consider this use incorrect

Example

Everyone has their own way of doing things.

Synonyms and related words
Definition their in American English