Definition of vigil noun from the Oxford Advanced American Dictionary

 

vigil

 noun
noun
NAmE//ˈvɪdʒəl//
 
[countable, uncountable]
 
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a period of time when people stay awake, especially at night, in order to watch a sick person, say prayers, protest, etc. His parents kept a round-the-clock vigil at his bedside. Students held a candlelit vigil against the war.
See the Oxford Advanced Learner's Dictionary entry: vigil