sir

play
noun \ˈsər\

Definition of sir

  1. 1a :  a man entitled to be addressed as sir —used as a title before the given name of a knight or baronet and formerly sometimes before the given name of a priestb :  a man of rank or position

  2. 2a —used as a usually respectful form of addressb capitalized —used as a conventional form of address in the salutation of a letter

Recent Examples of sir from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sir'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of sir

Middle English, from sire


SIR Defined for English Language Learners

sir

play
noun

Definition of sir for English Language Learners

  • —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)

  • Sir —used without a name as a form of address at the beginning of a formal letter

  • Sir —used as a title before the name of a knight or baronet


SIR Defined for Kids

sir

play
noun \ˈsər\

Definition of sir for Students

  1. 1 —used without a name as a form of polite address to a man May I help you, sir?

  2. 2 cap —used as a title before the given name of a knight or a baronet Sir Walter Raleigh

  3. 3 cap —used without a name as a form of address at the beginning of a letter



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