Dictionary.net

• 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.

2010 - New Age Dictionary Database
By Oddity Software

• 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.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.