behaviour
Americannoun
noun
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manner of behaving or conducting oneself
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behaving with careful good manners
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psychol
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the aggregate of all the responses made by an organism in any situation
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a specific response of a certain organism to a specific stimulus or group of stimuli
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the action, reaction, or functioning of a system, under normal or specified circumstances
Spelling
See -or 1.
Other Word Forms
Derived Forms
Etymology
Origin of behaviour
C15: from behave ; influenced in form by Middle English havior , from Old French havoir , from Latin habēre to have
Explanation
Your behaviour is the way you act in various situations. Note that this word ends with "our," which is the British spelling, while the American English spelling is behavior. This discrepancy is common, and either spelling is correct. The Late Middle English word behavoure meant "to have possession," which seemingly refers to a person in control of his or her actions. If you are accused of childish behaviour, you might be acting as though you have little self-control. Scottish musician Shirley Manson once said: "A lot of celebrities just want money, fame, power, fancy cars, houses all over the world and have people bow down to them. To me, that's frightful behaviour."
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The orders were introduced as part of the Anti-Social Behaviour, Crime and Policing Act 2014.
From BBC • Jun. 13, 2026
He wrote The Human Zoo and Intimate Behaviour, in Malta, and then became fascinated by the expressive body language of the people of the Mediterranean.
From BBC • Apr. 20, 2026
Their research was recently published in Nature Human Behaviour.
From Science Daily • Feb. 20, 2026
These would involve managers and staff from leading "Attendance and Behaviour Hub" schools visiting targeted schools and vice versa, so they can see effective methods "in action".
From BBC • Feb. 10, 2026
He wrote: “Distraction during the appearance of the stimulus is always punished with the prolongation of the process,” notes a biography published by the Donders Institute for Brain, Cognition, and Behaviour in the Netherlands.
From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.