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Definition of twilight noun from the Oxford Advanced American Dictionary

     

    twilight

     noun
    noun
    NAmE//ˈtwaɪlaɪt//
     
    [uncountable]
     
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  1. 1the faint light or the period of time at the end of the day after the sun has gone down It was hard to see him clearly in the twilight. We went for a walk along the beach at twilight.
  2. 2the twilight (of something) the final stage of something when it becomes weaker or less important than it was the twilight years (= the last years of your life)
See the Oxford Advanced Learner's Dictionary entry: twilight