/dhair/ ; unstressed /dheuhr/ , pron.
1. a form of the possessive case of they used as an attributive adjective, before a noun: their home; their rights as citizens; their departure for Rome.
2. (used after an indefinite singular antecedent in place of the definite masculine form his or the definite feminine form her ): Someone left their book on the table. Did everyone bring their lunch? Cf. theirs .
[ 1150-1200; ME theirra their; r. OE thara, thaera; cf. THEY ]
Usage . See he 1 , me, they .