from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Used as a modifier before a noun: their accomplishments; their home town.
  • adj. Usage Problem His, her, or its: "It is fatal for anyone who writes to think of their sex” ( Virginia Woolf). See Usage Notes at he1, they.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • pro. Belonging to, from, of, or relating to, them.
  • pro. Belonging to someone of unspecified gender.

from the GNU version of the Collaborative International Dictionary of English

  • prep. The possessive case of the personal pronoun they.

from The Century Dictionary and Cyclopedia

  • See they.


Middle English, from Old Norse theira, theirs.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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