theirs

Meanings

1. 1
   pron

   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.

2. 2
   pron

   Their house or home.

   Let's go over to theirs.

Etymology

From Middle English theires, attested since the 1300s. Equivalent to their + -s (compare -'s); formed by analogy to his. Displaced theirn (from Middle English theiren, formed by analogy to mine, thine) in standard speech.