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.

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 …

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

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

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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 …

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

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The capitalized Sir indicates that a man is a knight or a baronet. Real-life examples: Sir Lancelot and Sir Gawain were two of the knights who served the legendary King Arthur.

Definition of sir noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.