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Sir is a formal honorific address in English for men, derived from Sire in the High Middle Ages. Both are derived from the old French " Sieur " (Lord), brought to England by the French-speaking …

The meaning of SIR is a man entitled to be addressed as sir —used as a title before the given name of a knight or baronet and formerly sometimes before the given name of a priest.

The Society of Interventional Radiology (SIR) is the premier professional organization representing interventional radiologists worldwide. With a legacy of excellence spanning decades, we are …

SIR definition: a respectful or formal term of address used to a man. See examples of sir used in a sentence.

Sir is used at the beginning of a formal letter to a man you do not know: Dear Sir

People sometimes say sir as a very formal and polite way of addressing a man whose name they do not know or a man of superior rank. For example, a shop assistant might address a male customer as sir.

Sir definition: Used as an honorific before the given name or the full name of baronets and knights.

2 days ago · sir (plural sirs) A man of a higher rank or position. A respectful term of address to a man of higher rank or position, particularly: quotations

“At ease, lieutenant.” “Yes sir, captain.” Sir, I don't think I was speeding. Sir, can you help me with this math problem? Dinner is ready, sir.