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What does alertness mean?

Looking for the meaning or definition of the word alertness? Here's what it means.

Noun
  1. The quality of being alert or on the alert
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Examples
The malnourished suffer from impaired health, reduced physical strength, diminished mental alertness, and high rates of infant mortality.
Aroma advocates claim that rosemary, peppermint, basil and jasmine scents, alone or in combination, may improve your mental alertness.
All had varying degrees of confusion, lack of alertness, agitation, anxiety, insomnia, depressed mood, and irritability.
He actually had some sleepless nights as he went on checking the alertness of the security personnel drafted for the exhibition.
Its taste was pretty similar to dark balsamic vinegar, but my tastebuds may have been past their peak of alertness by then.
Only during the first and last two hours of your waking day is alertness significantly impaired.

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