vigilance vigilance /ˈvɪdʒələns/

noun

1. () The process of paying close and continuous attention  ( wakefulness , watchfulness , alertness , vigilance )
   the process of paying close and continuous attention
    Wakefulness, watchfulness, and bellicosity make a good hunter
   wakefulness, watchfulness, and bellicosity make a good hunter
    Vigilance is especially susceptible to fatigue
   vigilance is especially susceptible to fatigue
   
2. Vigilant attentiveness  ( vigilance , watchfulness , weather eye )
   vigilant attentiveness
    He keeps a weather eye open for trouble
   he keeps a weather eye open for trouble