sir

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sir /ˈsɚ/ noun
plural sirs
sir
/ˈsɚ/
noun
plural sirs
Learner's definition of SIR
[noncount]
used without a name as a form of polite address to a man you do not know compare ma'am, madam, miss
used without a name as a form of polite address to a man of rank or authority (such as a military or police officer, teacher, or master)
Sir [count] used without a name as a form of address at the beginning of a formal letter
Sir [noncount] used as a title before the name of a knight or baronet
[noncount] US, informal used in the phrases no sir and yes sir for emphasis, to show surprise, etc.
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