u·ni·for·mi·tar·i·an·ism 
(y′nə-fôr′mĭ-târē-ə-nĭz′əm)
(y′nə-fôr′mĭ-târē-ə-nĭz′əm)n.
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.
u′ni·for′mi·tari·an adj. & n.