|1.||a sudden, extensive, or notable disaster or misfortune|
|2.||the denouement of a play, esp a classical tragedy|
|3.||a final decisive event, usually causing a disastrous end|
|4.||Also called: cataclysm any sudden and violent change in the earth's surface caused by flooding, earthquake, or some other rapid process|
|[C16: from Greek katastrophē, from katastrephein to overturn, from strephein to turn]|
in literature, the final action that completes the unraveling of the plot in a play, especially in a tragedy. Catastrophe is a synonym of denouement. The term is sometimes applied to a similar action in a novel or story.
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