theirs

theirs

pronoun, singular or pl in constr \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