What does alertness mean or Definition?

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List of meaning for alertness

watchfulness, wakefulness, vigilance, alertness(noun)

the process of paying close and continuous attention

"wakefulness, watchfulness, and bellicosity make a good hunter"; "vigilance is especially susceptible to fatigue"

alertness, alerting(noun)

a state of readiness to respond

"alerting was indicated by the desynchronization of the EEG"

alertness, sharp-sightedness, on the qui vive(noun)

lively attentiveness

a close attentiveness to avoiding danger

drove through the fog with extra alertness, as the road signs repeatedly warned of deer and moose crossings

the state of being constantly attentive and responsive to signs of opportunity, activity, or danger

we observed the U.S. border patrol's intensified alertness for drug smugglers at the border stations

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