Definition of vigilance noun from the Oxford Advanced Learner's Dictionary

 

vigilance

 noun
noun
BrE BrE//ˈvɪdʒɪləns//
 
; NAmE NAmE//ˈvɪdʒɪləns//
 
[uncountable](formal)
 
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great care that is taken to notice any signs of danger or trouble synonym watchfulness She stressed the need for constant vigilance.