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determiner British English pronunciation: their /ðeə(r)/
Their is used as a possessive determiner (followed by a noun), being a possessive form of they.
 
  1. 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

    Workers are afraid that they will lose their jobs.

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

    of their own:

    They have children of their own.

    Thesaurus entry for this meaning of  theirThesaurus entry for this meaning of their
  2. 2
    mainly spoken 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

    Everyone has their own way of doing things.

    Thesaurus entry for this meaning of  theirThesaurus entry for this meaning of their
    See also  they

This is the British English definition of their. View American English definition of their.

Change your default dictionary and thesaurus to American English.

 

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