used as a polite way of addressing a man whose name you do not know, for example in a shop or restaurant
آقا, جناب
see also madam
2
A2
used at the beginning of a formal business letter when you do not know the name of the man or people that you are dealing with
آقا, جناب
Dear Sir/Sirs
Dear Sir or Madam
3
A2
a title that is used before the first name of a man who has received one of the highest British honours (= a knight), or before the first name of a baronet
سر
Sir Paul McCartney
Thank you, Sir Paul.
compare lady
4
A2
used as a form of address to a man in a position of authority, especially in the armed forces
جناب, جنابعالی
‘Report to me tomorrow, corporal!’ ‘Yes, sir!’
5
used as a form of address by children in school to a male teacher