Definition of theirs pronoun from the Oxford Advanced Learner's Dictionary



BrE BrE//ðeəz//
; NAmE NAmE//ðerz//
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(the possessive form of they) of or belonging to them Theirs are the children with very fair hair. It's a favourite game of theirs. Word Origin Middle English: from their + -'s.
See the Oxford Advanced American Dictionary entry: theirs