American Dictionary

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Definition behavior in American English

behavior noun

[uncountable] noun
/bɪˈheɪvjər/

Behavior is usually an uncountable noun, so it is rarely used in the plural:

✗ Parents should be able to prevent their children’s crimes or bad behaviors.

✓ Parents should be able to prevent their children’s crimes or bad behavior.

✗ The media often encourage violence and aggressive behaviors.

✓ The media often encourage violence and aggressive behavior.

The plural form “behaviors” is a specialized term used in fields such as psychology, social science, and education. This use is much less common than the uncountable use:

In this chapter, we discuss strategies for dealing with the problem behaviors of young children.

1

the way that someone behaves

Example

Anna was sick of her brother's annoying behavior.

Synonyms and related words
2

the way that a substance, metal, etc. usually behaves

Example

Scientists are studying the behavior of certain elements in a humid environment.

Synonyms and related words
Definition behavior in American English