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Definition of sir:

  1. A man of social authority and dignity; a lord; a master; a gentleman; - in this sense usually spelled sire.
  2. A respectful title, used in addressing a man, without being prefixed to his name; - used especially in speaking to elders or superiors; sometimes, also, used in the way of emphatic formality.
  3. A title prefixed to the Christian name of a knight or a baronet.
  4. An English rendering of the LAtin Dominus, the academical title of a bachelor of arts; - formerly colloquially, and sometimes contemptuously, applied to the clergy.


headmaster, instructor, lord, educator, housemaster, You, Bud, faculty, coach, knight, sire, governor, headmistress, baron, head, Chief, priest, Mister, houseparent, headteacher.

Usage examples:

  • " That I can do, sir.

    - "With Moore At Corunna", G. A. Henty.
  • Here I met with Sir.

    - "Diary of Samuel Pepys, Complete Transcribed From The Shorthand Manuscript In The Pepysian Library Magdalene College Cambridge By The Rev. Mynors Bright", Samuel Pepys Commentator: Lord Braybrooke.
  • Of course I do, sir.

    - "A Mysterious Disappearance", Gordon Holmes.