Meaning of SIR in English

SIR

noun a title prefixed to the christian name of a knight or a baronet.

2. sir ·noun a man of social authority and dignity; a lord; a master; a gentleman;

— in this sense usually spelled sire.

3. sir ·noun an english rendering of the latin dominus, the academical title of a bachelor of arts;

— formerly colloquially, and sometimes contemptuously, applied to the clergy.

4. sir ·noun a respectful title, used in addressing a man, without being prefixed to his name;

— used especially in speaking to elders or superiors; sometimes, also, used in the way of emphatic formality.

Webster English vocab.      Английский словарь Webster.