theirs
pronoun, singular or plural in construction(theirs)
that which belongs to them —used without a following noun as a pronoun equivalent in meaning to the adjective their
theirs
pronoun, singular or plural in construction(theirs)
his or hers : his, hers —used with an indefinite third person singular antecedent
theirs
idiom(theirs)
that which belongs to or is connected with them : their one : their ones