1. 
   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 ...
   Found op http://www.encyclo.co.uk/webster/T/39
   
   
2. 
   Their
   • (pron. & a.) The possessive case of the personal pronoun they; as, their houses; their country.
   Found op http://thinkexist.com/dictionary/meaning/their/
   
   
3. 
   their
   1) '... ... finest hour' 2) '... over .. flock by night'
   Found op luke 3) 'a league of .. own' 4) 'a league of ... own' (1992
   
   

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