Definition of vigilantly adverb from the Oxford Advanced Learner's Dictionary

 

vigilantly

 adverb
adverb
BrE BrE//ˈvɪdʒɪləntli//
 
; NAmE NAmE//ˈvɪdʒɪləntli//
 
(formal)
 
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in a way that involves taking great care to notice any signs of danger or trouble