THEIR
Etymology
Determiner
their
Belonging to, from, of, or relating to, them (plural).
Belonging to someone (one person, singular).
Usage notes
• Regarding the use of singular their, see they.
• The words their, there, and they're are homophones in most English accents today. This often causes confusion between the three in writing.
Adverb
their
Misspelling of there.
Contraction
their
Misspelling of they’re.
Anagrams
• Erith, Reith, Rieth, rithe, tehri, theri-
Source: Wiktionary
Their, pron. & a. Etym: [OE. thair, fr. Icel. Þeirra, Þeira, 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: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition