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English definition of “Sir”

Sir

noun     strong /sɜːr/ US  /sɝː/ weak /r/ US  //
used as the title of a knight (= a man who has been given a rank of honour by a British king or queen ), with a first name or with both first and family names , but never with just the family name : Sir Walter (Scott)Royalty, aristocracy and titles
(Definition of Sir noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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