Meaning of the word alertness in English

What does alertness mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

alertness

US /əˈlɝːt.nəs/
UK /əˈlɝːt.nəs/

Noun

1.

the state of being ready to see, understand, and act in a particular situation:

Example:
One study found that the strongest factor influencing driver alertness was the time of day.
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