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their

 
 
/ðeər/ determiner

Definition

OF A GROUP belonging to or relating to a group of people, animals, or things that have already been talked about: It was their problem, not mine.
HIS/HER used to refer to what belongs to or relates to a person when you want to avoid saying 'his' or 'her' or when you do not know if the person is male or female: Did this person give their name?
(Definition of their determiner from the Cambridge Learner's Dictionary © Cambridge University Press)

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