definition of
vigilance

[1] #1 vigilance n. [watchfulness, wakefulness, alertness] the process of paying close and continuous attention; "wakefulness, watchfulness, and bellicosity make a good hunter"; "vigilance is especially susceptible to fatigue". wn

[2] #2 vigilance n. [watchfulness, weather eye] vigilant attentiveness; "he keeps a weather eye open for trouble". wn