theirとは

発音

• (英国発音) IPA^(key): /ðɛə(ɹ)/, /ðɛː(ɹ)/
• (米国発音) IPA^(key): /ðɛɚ/
• 韻: -ɛə(ɹ)
• 異形同音異義語: there, they're

限定詞

their

1. Belonging to, from, of, or relating to, them (plural).
   • 2012 May 5, Phil McNulty, “Chelsea 2-1 Liverpool”, in BBC Sport:

     For Liverpool, their season will now be regarded as a relative disappointment after failure to add the FA Cup to the Carling Cup and not mounting a challenge to reach the Champions League places.

   • 2013 July 20, “The attack of the MOOCs”, in The Economist, volume 408, number 8845:

     Since the launch early last year of […] two Silicon Valley start-ups offering free education through MOOCs, massive open online courses, the ivory towers of academia have been shaken to their foundations. University brands built in some cases over centuries have been forced to contemplate the possibility that information technology will rapidly make their existing business model obsolete.

   they will meet tomorrow at their convenience;  this is probably their cat

2. Belonging to someone (one person, singular).
   • 1594, Shakespeare, William, The Comedy of Errors, act IV, scene 3, line 1172:

     There's not a man I meet but doth salute me
     As if I were their well-acquainted friend […]

   • 2006, St. John Ambulance, First on the Scene: Student Reference Guide, →ISBN, Lesson 2, page 3:

     Place the casualty on their back with feet and legs raised—this is called the shock position. [emphasis in original] Once the casualty is positioned, cover them to preserve body heat, but do not overheat.

   • 2007, Rowling, J. K., Harry Potter and the Deathly Hallows, (quoted edition: London: Bloomsbury, 2008, →ISBN, page 93):

     ‘I mean ... if somebody made a mistake,’ Harry went on, ‘and let something slip, I know they didn’t mean to do it. It’s not their fault,’ he repeated, again a little louder than he would usually have spoken.

   • For more examples of usage of this term, see Citations:their.

使用する際の注意点

• Regarding the use of singular their, see they.
• Distinguish “their” from “there” and “they’re”. “Their” signifies ownership. “There” designates a place (compare here). “They’re” means “they are”.
• This word is an exception of the "I before E, except after C" rule, as the combination of "ei" in the middle of the word is not after a "c".

関連する語

• they, them (personal pronouns, subject かつ object case)
• theirs (possessive pronoun)

副詞

their

1. Misspelling of there.

短縮形

their

1. Misspelling of they’re.

参考

アナグラム

• Reith, Rieth, rithe, tehri, theri-