sir

The word “sir” means a polite or respectful way to address a man, especially one of higher rank, a stranger, or a teacher. In plain terms, a respectful term for addressing a man, or the title given to knights.

“Sir” is pronounced sur (/sɝ/ in IPA).

Here is “sir” used in a sentence: “Excuse me, sir, is this seat taken?”

“Sir” is a noun.

The word “sir” comes from Latin. From Middle English sir, an unstressed form of sire, ultimately from Latin senior ("older, elder").

“Sir” is a very common word in modern English, usually learned at around the A1 level.

“Sir” has 2 distinct senses listed in this dictionary. The most common is: a polite or respectful way to address a man, especially one of higher rank, a stranger, or a teacher.

Both are polite, formal ways to address someone you may not know or who holds a higher rank. "Sir" is used for a man, while "madam" (or "ma'am") is the female equivalent, used for a woman. They mirror each other in tone and setting, differing only in the gender of the person being addressed.

"Sir" is formal and respectful. People use it with strangers, customers, teachers, officers, and anyone of higher rank or authority. In everyday casual conversation between friends it can sound stiff or even sarcastic, so it belongs mainly to polite, professional, or deferential situations rather than relaxed ones.

Use "sir" to address a man politely without using his name — a customer, a stranger, a superior at work, or a teacher. It signals respect and good manners, and is standard in the military, service, and hospitality. Capitalise it as "Sir" when it precedes a knight's name, as in "Sir Elton John."