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1911 Encyclopædia Britannica/Cataclysm

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CATACLYSM (Gr. κατακλυσμός, a deluge), a great flood or deluge (q.v.). The term is used in geology to denote an overwhelming catastrophe which has produced sudden changes in the earth’s surface; and also, figuratively, of any great and violent change which sweeps away the existing social or political order.