Definition of flashback noun from the Oxford Advanced American Dictionary

     

    flashback

     noun
    noun
    NAmE//ˈflæʃbæk//
     
     
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  1. 1 [countable, uncountable] a part of a movie, play, etc. that shows a scene that happened earlier in time than the main story The events that led up to the murder were shown in a series of flashbacks. The reader is told the story in flashback. compare flash-forward
  2. 2[countable] a sudden, very clear, strong memory of something that happened in the past that is so real you feel that you are living through the experience again war veterans suffering from nightmares and flashbacks
See the Oxford Advanced Learner's Dictionary entry: flashback