sir
noun
- a man of rank; lord
- a respectful term of address used to a man: not followed by the given name or surname and often used in the salutation of a letter: Dear Sir
- the title used before the given name or full name of a knight or baronet: Sir Walter Ralegh
- Archaic a term of address used with the title of a man's office, rank, or profession: sir priest, sir judge, sir knight
See sir in American Heritage Dictionary 4
(sûr)
noun- Sir Used as an honorific before the given name or the full name of baronets and knights.
- Used as a form of polite address for a man: Don't forget your hat, sir.
- Used as a salutation in a letter: Dear Sir or Madam.
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