An event producing a subversion of the order or system of things; a final event, usually of a calamitous or disastrous nature; hence, sudden calamity; great misfortune.
- A great, often sudden calamity.
- A complete failure; a fiasco: The food was cold, the guests quarreled—the whole dinner was a catastrophe.
- The concluding action of a drama, especially a classical tragedy, following the climax and containing a resolution of the plot.
- A sudden violent change in the earth's surface; a cataclysm.