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.

One who accepts uniformitarianism, or the uniformitarian doctrine.

(chiefly geology) The scientific principle that natural processes operated in the past in the same way and at the same rates that they operate today.

plural of uniformitarian

One who believes in uniformitarianism.

plural of uniformitarianist

uniformitarian; relating to, or suggesting, uniformitarianism