Sir noun Meaning, definition in Cambridge English Dictionary
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Meaning of "Sir" - English Dictionary

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Sirnoun

uk   strong /sɜːr/  us   /sɝː/ weak /r/  //
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)
More examples
  • Sir Geoffrey will see you now.
  • Sir Harold and Lady Wilson arrived at eight.
(Definition of Sir noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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