Note: The translation for this entry is currently under quality review. Some content is temporarily displayed in English only.
behavior
[bɪˈheɪvjə]
It describes the observable outward action of a subject rather than its internal state or intent. When applied to humans, it often carries a moral or social judgment—"good behavior" implies adherence to norms, while "strange behavior" suggests a deviation from them.
In technical contexts (software, physics, chemistry), it shifts from a moral quality to a predictable pattern of response. It refers to how an input results in a specific output or how a material reacts to external stressors.
Unlike "conduct," which is more formal and often relates to professional or ethical standards, "behavior" is the broader, more neutral term used across psychology, biology, and engineering.
Uncountable when discussing the general conduct of a person ('His behavior is exemplary'). Countable when referring to specific, distinct types of reactions or patterns observed in science or software ('We observed several unusual behaviors in the test group').
💬Casual Conversation
Dad's passive-aggressive texts are really getting on my last nerve.
Yeah, his boomer behavior is peak cringe, fr.
Meanings
Examples
The teacher praised the student for her excellent behavior in class.
The engineers are analyzing the behavior of the new operating system.
Scientists studied the behavior of the alloy under extreme pressure.
Collocations & Compounds
abnormal behavior
Actions that deviate from the norm or expected standard.
The doctor noted the patient's abnormal behavior.
child behavior
The way children act and conduct themselves.
Effective strategies for managing child behavior are essential.
social behavior
The way individuals interact with others in society.
Understanding social behavior is key to sociology.
erratic behavior
Actions that are unpredictable and inconsistent.
His erratic behavior worried his colleagues.
desired behavior
Actions that are encouraged or sought after.
Positive reinforcement encourages desired behavior.
Idioms & Sayings
out of character behavior
Actions that are not typical for a person.
His sudden anger was completely out of character behavior for him.
good behavior
Conduct that is proper and acceptable.
He was released early for good behavior.
bad behavior
Conduct that is improper or unacceptable.
The teacher addressed the student's bad behavior.
Etymology
The word 'behavior' comes from the Middle English word 'beheref', which means 'conduct' or 'demeanor'. It is derived from the Old English verb 'behabban', meaning 'to keep, restrain, or hold back'. The prefix 'be-' intensifies the meaning of the verb 'habban' (to have or hold). Over time, the word evolved to describe the outward actions and reactions of living beings, and later extended to the functioning of inanimate systems and objects. The spelling 'behavior' is the American English variant, while 'behaviour' is the British English spelling, both stemming from the same root.