Webster's English Dictionary

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sir

sir \(')s*r\ n [ME, fr. sire] 1a: a man of rank or position  1b: a man 
   entitled to be addressed as sir - used as a title before  the given name of 
   a knight or baronet and formerly sometimes before the given name of a 
   priest 2a: - used as a usu. respectful form of address  cap  2b: - used as 
   a conventional form of address in the salutation of a lette r