Dictionary

theirs

pronoun, singular or plural in construction \ˈtherz\

Definition of THEIRS

1
:  that which belongs to them —used without a following noun as a pronoun equivalent in meaning to the adjective their
2
:  his or hers :  his, hers —used with an indefinite third person singular antecedent <I will do my part if everybody else will do theirs>

First Known Use of THEIRS

14th century

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