Definition of nightfall noun from the Oxford Advanced American Dictionary

     

    nightfall

     noun
    noun
    NAmE//ˈnaɪtfɔl//
     
    [uncountable](formal or literary)
     
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  1. 1the time in the evening when it becomes dark synonym dusk
  2. 2 He wanted to be home before nightfall.
See the Oxford Advanced Learner's Dictionary entry: nightfall