GNU Collaborative International Dictionary of English

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Found one definition

1.       
   flashback n.
   1. a transition (in literary or theatrical works or films) to an earlier event or scene; also, the scene thus introduced.
   
   [WordNet 1.5]
   
   
   2. An unusually vivid recollection of a prior experience, often one that is traumatic, such as scenes from combat or a criminal assault, or induced by hallucinogenic drugs such as LSD; when accompanied by hallucinations it is called flashback hallucinosis.
   
   [PJC]