sir

Use the word sir as a formal title for a man. People often use sir to respectfully or politely address someone they don't know well.

When you're saying hello to a man who's been knighted by the Queen of England, you should call him sir — it's the official way to address a knight. You can also use this word when you're writing a formal business letter: "Dear Sir or Madam, I am interested in applying for a job at your candy company." And if you're a waiter, you might use it too: "Your hamburger, sir."

Definitions of sir
1

n term of address for a man

Type of:
adult male, man
an adult person who is male (as opposed to a woman)

Sign up, it's free!

Whether you're a student, an educator, or a life-long learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.