As the female equivalent for knighthood is damehood, the suo jure female equivalent term is typically dame. Definition of sir noun in oxford advanced learner's dictionary The meaning of sir is a man entitled to be addressed as sir โused as a title before the given name of a knight or baronet and formerly sometimes before the given name of a priest.
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Used without a name as a form of polite address to a man you do not know
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)
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 is used at the beginning of a formal letter to a man you do not know
