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alert

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adjective British English pronunciation: alert /əˈlɜː(r)t/
  1. 1
    able to think in a clear and intelligent way

    She’s remained physically fit and mentally alert.

  2. 2
    paying attention to what is happening and ready to react quickly if necessary
    alert to:

    Parents must be alert to the symptoms of the disease.

derived word

alertness

noun [uncountable]

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