behaviour

The word “behaviour” means the British spelling of "behavior" — the way a person, animal, or system acts. In plain terms, how someone or something acts — British spelling of "behavior.".

Here is “behaviour” used in a sentence: “The teacher kept a note of each pupil's behaviour.”

“Behaviour” is a noun.

“Behaviour” is a fairly common word in modern English, usually learned at around the A2 level.

There is no difference in meaning: "behaviour" is the British spelling and "behavior" is the American spelling of the same word, meaning the way a person, animal, or system acts. Use "behaviour" in British, Australian, and most Commonwealth English, and "behavior" in American English.

Yes. "Behaviours" is used when referring to distinct types or instances of behaviour, as in "the study measured several risky behaviours." When talking about conduct in general, the uncountable singular "behaviour" is standard.

Frequent pairings include "good behaviour," "bad behaviour," "antisocial behaviour," "consumer behaviour," and "behaviour change." The word also appears in the fixed phrase "be on your best behaviour."

Match the variety of English your institution or publisher requires: "behaviour" for British-style guides and "behavior" for American ones. Whichever spelling you choose, use it consistently throughout the document.