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

     

    twilight

     noun
    noun
    BrE BrE//ˈtwaɪlaɪt//
     
    ; NAmE NAmE//ˈtwaɪlaɪt//
     
    [uncountable] The sun and the moon
     
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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. Wordfinderdaylight, eclipse, equinox, ray, rise, solar, solstice, the sun, twilight, the universe See related entries: The sun and the moon
  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)
  3. Word Origin late Middle English: from Old English twi- ‘two’ (used in an obscure sense in this compound) + the noun light.Extra examples She stared into the gathering twilight. She walked away into the thickening twilight. They gazed up at the twilight sky. a forgotten man who spent his twilight years alone in the twilight hour before dawn the twilight zone between living and merely existing It was hard to see him clearly in the thickening twilight. These animals are most active during the hours of twilight around dawn and dusk. We went for a walk along the beach at twilight.
See the Oxford Advanced American Dictionary entry: twilight