"alertness" in the noun sense
1. watchfulness, wakefulness, vigilance, alertness
the process of paying close and continuous attention
"wakefulness, watchfulness, and bellicosity make a good hunter"
"vigilance is especially susceptible to fatigue"
2. alertness, alerting
a state of readiness to respond
"alerting was indicated by the desynchronization of the EEG"
3. alertness, sharp-sightedness, on the qui vive
Source: WordNet® (An amazing lexical database of English)
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