• Webster's Revised Unabridged Dictionary
    • a Uniformitarian (Geol) Of, pertaining to, or designating, the view or doctrine that existing causes, acting in the same manner and with essentially the same intensity as at the present time, are sufficient to account for all geological changes.
    • n Uniformitarian (Geol) One who accepts uniformitarianism, or the uniformitarian doctrine.
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Century Dictionary and Cyclopedia
    • uniformitarian Of or pertaining to uniformity or the doctrine of uniformity. See the noun.
    • n uniformitarian One who upholds a system or doctrine of uniformity; specifically, in geology, one who advocates the theory that causes now active in bringing about geological changes have always been similar in character and intensity, or, in other words, that there has been no essential change in the character of geological events during the lapse of the geological ages: the opposite of catastrophist.
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In literature:

Nothing could be simpler or more clearly uniformitarian.
"A History of Science, Volume 3(of 5)" by Henry Smith Williams
The uniformitarian teaching which Lyell deduced from geological observation had gained acceptance.
"Darwin and Modern Science" by A.C. Seward and Others
He was ignorant enough to think that the glacial epoch looked like a chasm between him and a uniformitarian world.
"The Education of Henry Adams" by Henry Adams
For consistent uniformitarianism postulates evolution as much in the organic as in the inorganic world.
"The Life and Letters of Charles Darwin, Volume I (of II)" by Charles Darwin
This is the view of the Uniformitarians.
"The Ancient Life History of the Earth" by Henry Alleyne Nicholson
The grave of uniformitarianism is already covered with grass.
"Recreations in Astronomy" by Henry Warren
By UNIFORMITARIANISM, I mean especially, the teaching of Hutton and of Lyell.
"Lay Sermons, Addresses and Reviews" by Thomas Henry Huxley
He was the forerunner of Lyell and of the uniformitarian school of geologists.
"Lamarck, the Founder of Evolution" by Alpheus Spring Packard
It has often been assumed that Lyell was led by the study of Hutton's works to adopt the Uniformitarian' doctrines.
"The Coming of Evolution" by John W. (John Wesley) Judd
By Uniformitarianism I mean especially the teaching of Hutton and of Lyell.
"Aphorisms and Reflections from the works of T. H. Huxley" by Thomas Henry Huxley