their Definition in Cambridge American English Dictionary
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Definition of "their" - American English Dictionary

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theirpronoun [pl]

 us   /ðeər/
belonging to or connected with them; the possessive form 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)
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