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Definition alert in British English

alert adjective

adjective
/əˈlɜː(r)t/
1

able to think in a clear and intelligent way

Example

She's remained physically fit and mentally 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 British English