'alertness' definitions:
Definition of 'alertness'
From: WordNet
noun
The process of paying close and continuous attention; "wakefulness, watchfulness, and bellicosity make a good hunter"; "vigilance is especially susceptible to fatigue" [syn: watchfulness, wakefulness, vigilance, alertness]
noun
A state of readiness to respond; "alerting was indicated by the desynchronization of the EEG" [syn: alertness, alerting]
noun
Lively attentiveness [syn: alertness, sharp-sightedness, on the qui vive]