/vij"euh leuhns/ , n.
1. state or quality of being vigilant; watchfulness: Vigilance is required in the event of treachery.
2. Pathol. insomnia.
[ 1560-70; alter. (-ANCE for -ANCY) of obs. vigilancy vigilantia; see VIGILANT, -ANCY ]
Syn. 1. alertness, attention, heedfulness, concern, care.