noun. The doctrine of uniformity in the geological history of the earth; -- in part equivalent to uniformitarianism, but also used, more broadly, as opposed to catastrophism.

noun. The doctrine of uniformity in the geological history of the Earth; in part equivalent to uniformitarianism, but also used, more broadly, as opposed to catastrophism.

"Evolution used to have two main theories: uniformism inherited from Darwinism and catastrophism handed down from Biblical stories but as well as from some geological evidence."