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Definition of “their” - English Dictionary

"their" in American English

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theirpronoun [pl]

 us   /ðeər/
belonging to or ​connected with them; the ​possessiveform of they, used before a ​noun: It was their ​money, and they could ​spend it as they ​liked. infml Their is also used to refer to a ​person whose ​sex is not ​known: Someone ​forgot to take their ​umbrella.
(Definition of their from the Cambridge Academic Content Dictionary © Cambridge University Press)







"their" in British English

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theirdeterminer

uk   /ðeər/  us   /ðer/
A1 of or ​belonging to them: He gave them their ​coats.B1 used to refer to one ​person in ​order to ​avoid saying "his or her": One of the ​students has ​left their ​book behind.

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(Definition of their from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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