Definition of "theirs" in English

pronoun

1. That or those belonging to them; the possessive case of they, used without a following noun.

   • This luggage is theirs. These passports are also theirs.
   • Theirs cost a lot more than ours.
   • That cat of theirs got into our garden again.

2. (informal) Their house or home.

   • Let's go over to theirs.