Sir (noun)

  1. A title used before a man's given name, especially as a term of address in formal situations.
  2. A title used for a knight or baronet.

Origin:

Middle english, from old english sīr, from proto-germanic *sīzaz.

Examples:

  1. Good morning, sir. How can I help you today?
  2. The knight was known as Sir Lancelot.
  3. The actor was addressed as Sir Lawrence Olivier.
  4. Sir, may I have your attention, please?
  5. The baronet was referred to as Sir John.
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