Etymology
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alertness (n.)

1714, from alert (adj.) + -ness.

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Definitions of alertness

alertness (n.)
the process of paying close and continuous attention;
Synonyms: watchfulness / wakefulness / vigilance
alertness (n.)
a state of readiness to respond;
Synonyms: alerting
alertness (n.)
lively attentiveness;
Synonyms: sharp-sightedness / on the qui vive
From wordnet.princeton.edu