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English definition of “sir”

sir

noun [as form of address]     /sɜːr/ US  /sɝː/ (also Sir) formal
B1 used as a formal and polite way of speaking to a man, especially one who you are providing a service to or who is in a position of authority : Would you like to see the menu , sir? "Did you hear what I said?" "Yes, Sir." → Compare madam, Miss, MsFriendly and unfriendly terms of address mainly UK sometimes used by children to address or refer to teachers who are men: Can I go to the toilet , sir? Indian English used after the name of a man, especially one who is in a position of authority , in order to be polite or show respect : John Sir Dear Sir B2 used to begin a formal letter to a man whose name you do not know . " Dear Sirs" is an old fashioned way of beginning a letter to a company .Written greetingsLetters, notes and cards Dear Sir or Madam used to begin a formal letter when you do not know if the person you are writing to is a man or a womanWritten greetingsLetters, notes and cards
(Definition of sir noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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