Definitions
The state of being watchful and ready to notice things.
Word origin
From alert + -ness.
Used in a sentence
“THE human body was meant to have a midafternoon nap, according to a new consensus among sleep researchers who are studying the biological rhythms of sleep and alertness.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Ready attention”9 letters
02“Watchful state”9 letters
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