supporting, conforming to, or derived from a theory or doctrine about uniformity, especially on the subject of geology.
Geology. of or pertaining to the thesis that processes that operated in the remote geological past are not different from those observed now.
a person who accepts or supports a uniformitarian theory.

1830–40; uniformit(y) + -arian

uniformitarianism, noun
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World English Dictionary
uniformitarian (ˌjuːnɪˌfɔːmɪˈtɛərɪən)
1.  of or relating to uniformitarianism
2.  of, characterized by, or conforming to uniformity
3.  a supporter of a theory of uniformity or of uniformitarianism

uniformitarianism (ˌjuːnɪˌfɔːmɪˈtɛərɪəˌnɪzəm)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
uniformitarianism   (y'nə-fôr'mĭ-târ'ē-ə-nĭz'əm)  Pronunciation Key 
The theory that all geologic phenomena may be explained as the result of existing forces having operated uniformly from the origin of the Earth to the present time. See Note at Lyell.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
All were rooted in uniformitarianism, as the idea was known.
They admit the occasional catastrophe, but not enough so as to cause them to utterly throw out uniformitarianism completely.
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