Definition of "sir" []

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

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""He read, sir," rejoined Pott, laying his hand on Mr. Pickwick's knee and looking round with a smile of intellectual superiority, "he read for metaphysics under the letter _M_, and for China under the letter _C_, and _combined his information_, _sir_.""
• "Romney would more than likely get confused, if he ever had to decide on military action, if he was American or the Taliban, and this sir is a risk no American can take. best quote today so far. jim"
• "God, sir, is most definitely guiding and protecting your steps."