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Definition alert in American English

alert adjective

adjective
/əˈlɜrt/
1

able to think in a clear and intelligent way

Example

He's remarkably alert for his age.

Example

Regular exercise could help you to feel better, look better, and be more alert.

Synonyms and related words
2

paying attention to what is happening and ready to react quickly if necessary

Example

Parents must be alert to the symptoms of the disease.

Synonyms and related words
Definition alert in American English