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Definition of “alert” - English Dictionary

"alert" in American English

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alertadjective

 us   /əˈlɜrt/
quick to see, understand, and act in a particular situation: When you’re driving, you must stay alert. We had to be alert to any danger signs in the economy.

alertnoun [C/U]

 us   /əˈlɜrt/
a warning to people to get ready to deal with something dangerous: [U] The police were on the alert for (= watching carefully for) any sign of trouble.
alert
verb [T]  us   /əˈlɜrt/
The auto company mailed letters to owners of that model car, alerting them of safety risks.
(Definition of alert from the Cambridge Academic Content Dictionary © Cambridge University Press)







"alert" in British English

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alertadjective

uk   /əˈlɜːt/  us   /əˈlɝːt/
C1 quick to see, understand, and act in a particular situation: I'm not feeling very alert today - not enough sleep last night! A couple of alert readers posted comments on the website pointing out the mistake. Parents should be alert to sudden changes in children's behaviour.

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alertness
noun [U] uk   /əˈlɜːt.nəs/  us   /əˈlɝːt.nəs/

alertnoun [C or U]

uk   /əˈlɜːt/  us   /əˈlɝːt/

alertverb [T]

uk   /əˈlɜːt/  us   /əˈlɝːt/
C2 to warn someone of a possibly dangerous situation: An anonymous letter alerted police to the possibility of a terrorist attack at the airport.

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(Definition of alert from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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Avoiding common errors with the word enough.
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