from The American Heritage® Dictionary of the English Language, 4th Edition
- 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.
from the GNU version of the Collaborative International Dictionary of English
- n. The uniformitarian doctrine.
from The Century Dictionary and Cyclopedia
- n. The theory advocated by uniformitarians: the opposite of catastrophism. See catastrophe, 3, and catastrophism.
From uniformitarian + -ism. (Wiktionary)