from The American Heritage® Dictionary of the English Language, 4th Edition
- pro. Used to indicate the one or ones belonging to you: The larger boots are yours. If I can't find my book, I'll take yours.
- pro. Used often with an adverbial modifier in the complimentary close of a letter: Sincerely yours.
- idiom yours truly I, myself, or me: "Let me talk about a typical day in the life of yours truly” ( Robert A. Spivey).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- pro. That which belongs to you (singular); the possessive second person singular pronoun used without a following noun.
- pro. That which belongs to you (plural); the possessive second person plural pronoun used without a following noun.
- pro. Written at the end of a letter, before the signature.
from the GNU version of the Collaborative International Dictionary of English
- pro. See the Note under your.
from The Century Dictionary and Cyclopedia
- That which belongs or those which belong to you: the possessive used without a following noun.
- [Yours is sometimes used in specific senses without reference to a noun previously mentioned: Your property.
- The persons belonging to you; your friends or relatives.
- Your letter: as, yours of the 16th inst. is at hand.
- Abbreviated yrs.
Middle English, from your, your; see your.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English youres, ȝoures, equivalent to your + -'s. (Wiktionary)