Catastrophism Definition

kə-tăstrə-fĭzəm
noun
The former theory that geologic changes are caused in general by sudden upheavals rather than gradually.
Webster's New World
The doctrine that changes in the earth's fauna and flora result from major catastrophic events that cause the die-off of many organisms and are followed by the appearance of new types of organisms.
American Heritage
An outlook envisioning imminent catastrophe.
Webster's New World
The prediction or expectation of cataclysmic upheaval, as in political or social developments.
American Heritage
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