Their
Pronunciation : Their
Part of Speech : pron.
Etymology : [OE. thair, fr. Icel. ?eirra, ?eira, of them, but properly gen. pl. of the definite article; akin to AS. th\'bera, th\'d6ra, gen. pl. of the definite article, or fr. AS. th\'d6ra, influenced by the Scandinavian use. See That.]
Definition : Defn: The possessive case of the personal pronoun they; as, their houses; their country.
Note: The possessive takes the form theirs (theirs is best cultivated. Nothing but the name of zeal appears 'Twixt our best actions and the worst of theirs. Denham.
& a.
Source : Webster's Unabridged Dictionary, 1913