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Collins Concise English Dictionary © HarperCollins Publishers:: uniformitarianism /ˌjuːnɪˌfɔːmɪˈtɛərɪəˌnɪzəm/ n - the concept that the earth's surface was shaped in the past by gradual processes, such as erosion, and by small sudden changes, such as earthquakes, of the type acting today rather than by the sudden divine acts, such as the flood survived by Noah (Genesis 6–8), demanded by the doctrine of catastrophism
u•ni•form•i•tar•i•an (yo̅o̅′nə fôr′mi târ′ē ən),USA pronunciation adj. - Geologysupporting, conforming to, or derived from a theory or doctrine about uniformity, esp. on the subject of geology.
- Geologyof or pertaining to the thesis that processes that operated in the remote geological past are not different from those observed now.
n. - Geologya person who accepts or supports a uniformitarian theory.
- uniformit(y) + -arian 1830–40
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