Their

Their pron. & adjective [ Middle English thair , from Icelandic þeirra , þeira , of them, but properly gen. plural of the definite article; akin to Anglo-Saxon ðāra , ðǣra , gen. plural of the definite article, or from Anglo-Saxon ð&#...
Found on http://www.encyclo.co.uk/webster/T/39

Their

• (pron. & a.) The possessive case of the personal pronoun they; as, their houses; their country.
Found on http://thinkexist.com/dictionary/meaning/their/
No exact match found