planation

(plā nās̸hən)

noun

the reduction of a land area by erosion to a nearly flat surface

Origin: plane + -ation

See planation in American Heritage Dictionary 4

noun
The process of erosion and deposition in which a nearly level surface is produced, as by streams, wind, or ocean currents.

Origin:

Origin: Latin plānum, flat surface; see plane1

Origin: + -ation

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