Webster
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Webster’s Revised Unabridged Dictionary · 1913

Their

Their, pron. & a. [OE. thair, fr. Icel. þeirra, þeira, of them, but properly gen. pl. of the definite article; akin to AS. ðāra, ðǣra, gen. pl. of the definite article, or fr. AS. ðǣra, influenced by the Scandinavian use. See That.] The possessive case of the personal pronoun they; as, their houses; their country.

☞ The possessive takes the form theirs when the noun to which it refers is not expressed, but implied or understood; as, our land is richest, but theirs is best cultivated.

Nothing but the name of zeal appears 'Twixt our best actions and the worst of theirs. Denham.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article.