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The Collaborative International Dictionary of English v.0.48 (gcide)

flashback \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]