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

  • pro. Used to indicate the one or ones belonging to thee.
  • adj. Used instead of thy before an initial vowel or h: "The presidential candidates are practicing the first rule of warfare: know thine enemy” ( Eleanor Clift).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • Singular second person prevocalic possessive determiner (preconsonantal form: thy).
  • pro. Singular second person possessive pronoun.

from the GNU version of the Collaborative International Dictionary of English

  • prep. A form of the possessive case of the pronoun thou, now superseded in common discourse by your, the possessive of you, but maintaining a place in solemn discourse, in poetry, and in the usual language of the Friends, or Quakers.

from The Century Dictionary and Cyclopedia

  • Of thee; the original genitive of the pronoun thou.
  • Of thee; belonging to thee. Compare mine, 2.
  • Belonging or pertaining to thee: in this sense a possessive.
  • Used attributively, with the force of an adjective: commonly preferred before a vowel to thy, and now used only in that situation.


Middle English thin; see thy.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Middle English thyn, þyn, from Old English þīn. Cognate to German dein, Danish, Swedish and Norwegian din, Faroese tín and Icelandic þinn. (Wiktionary)



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