sir - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “sir”

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sir

noun [C]  us   /sɜr/

sir noun [C] (USED TO ADDRESS)

a polite word used to address a man: Excuse me, sir, do you know what time it is? Sir is used at the beginning of a formal letter to a man you do not know: Dear Sir

sir noun [C] (USED AS TITLE)

(also Sir)used as a title with the first or full name of a man given a rank of honor by a king or queen
(Definition of sir from the Cambridge Academic Content Dictionary © Cambridge University Press)
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