What does "behavior" mean?

1. (human conduct) the way you act, especially toward other people or in public. 2. (animal actions) the way an animal or living thing acts in its environment. 3. (system operation) the way a machine, computer program, or system works.

How do you use "behavior"?

Usually uncountable when referring to general conduct. Can be countable (behaviors) when referring to specific types of actions.

Is it correct to say "He has a good behavior."?

No — say "He has good behavior.". In this sense, behavior is usually uncountable and does not take the article 'a'.

behavior

US //bɪˈheɪvjɝ// UK //bɪhˈeɪvjɐ// be·hav·ior

1 human conduct (n.)
A2 Elementary American English

the way you act, especially toward other people or in public.

the manner in which a person conducts themselves, particularly in relation to social norms or ethics.

Example

The teacher praised the boy for his excellent behavior during the school trip.

Example

The company has a strict code of conduct to ensure professional behavior among all employees during client interactions.

Usage

Usually uncountable when referring to general conduct.

Teacher's tip

Note the American spelling (behavior) versus the British spelling (behaviour).
Pitfall

He has a good behavior.

He has good behavior.

In this sense, behavior is usually uncountable and does not take the article 'a'.
2 animal actions (n.)
B1 Intermediate American English Technical Biology

the way an animal or living thing acts in its environment.

the observable response or actions produced by an organism in a particular situation.

Example

Scientists are studying the hunting behavior of lions in the wild.

Example

Ethologists observe mating behaviors to understand how specific signals evolved within the species over generations.

Usage

Can be countable (behaviors) when referring to specific types of actions.
- habits
- reactions

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3 system operation (n.)
B2 Upper Intermediate American English Technical Computing

the way a machine, computer program, or system works.

the characteristic operation or functioning of a device, software, or complex system.

Example

The latest software update changed the behavior of the home button.

Example

The engineer analyzed the erratic behavior of the cooling system to identify the mechanical failure.

Origin

Etymology tree Proto-Indo-European *h₁ep-der. Proto-Indo-European *h₁epsder. Proto-Indo-European *h₁epider. Proto-Indo-European *h₁pi Proto-Germanic *bider. Proto-Germanic *bi- Proto-West Germanic *bi- Proto-Indo-European *kap-der. Proto-Germanic *habjaną Proto-West Germanic *habbjan Proto-West Germanic *bihabbjan Old English behabban Middle English behaven Proto-Indo-European *gʰeh₁bʰ- Proto-Italic *haβēō Latin habeō Old French avoirbor. Middle English havour Middle English behavoure English behavior From Middle English behavoure, behaver, from behaven (modern behave), with the ending apparently in imitation of havour (see 'havior), a corruption of Old French aveir and/or avoir (“a having”), ultimately from Latin habēre. Compare Scots havings (“behavior”), from have (“to behave”). Replaced Old English ġebǣru.

Word family

Nounbehavior
Adjectivebehavioral