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

  • n. Used as an honorific before the given name or the full name of baronets and knights.
  • n. Used as a form of polite address for a man: Don't forget your hat, sir.
  • n. Used as a salutation in a letter: Dear Sir or Madam.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A man of a higher rank or position.
  • n. An address to a military superior of either sex.
  • n. An address to any male, especially if his name or proper address is unknown.
  • v. to address somebody using sir

from the GNU version of the Collaborative International Dictionary of English

  • n. A man of social authority and dignity; a lord; a master; a gentleman; -- in this sense usually spelled sire.
  • n. A title prefixed to the Christian name of a knight or a baronet.
  • n. An English rendering of the LAtin Dominus, the academical title of a bachelor of arts; -- formerly colloquially, and sometimes contemptuously, applied to the clergy.
  • n. A respectful title, used in addressing a man, without being prefixed to his name; -- used especially in speaking to elders or superiors; sometimes, also, used in the way of emphatic formality.

from The Century Dictionary and Cyclopedia

  • To address as “sir.”
  • To use the word sir.
  • n. A master; lord; sovereign.
  • n. A person of rank or importance; a personage; a gentleman.
  • n. Master; mister: a respectful and formal title of address, used formerly to men of superior rank, position, or age, and now to men of equal rank, or without regard to rank, as a mere term of address, without etymological significance.
  • n. Specifically— A title of honor prefixed to the Christian names of knights and baronets, and formerly applied also to those of higher rank, as the king; it was also prefixed occasionally to the title of rank itself: as, Sir King; Sir Knight; Sir Herald.
  • n. (b ) Formerly, a title of a bachelor of arts; hence, a title given to a clergyman; also, a clergyman.
  • n. A Persian measure of weight, equal to 16 miskals or ounces troy.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. term of address for a man
  • n. a title used before the name of knight or baronet


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

Middle English, variant of sire, sire; see sire.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English sir, from Old French sire ("master, sir, lord"), from Latin senior ("older, elder"), from senex ("old"). Compare sire, signor, seignior, señor.



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