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[pley-ney-shuh n, pluh-]
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noun Geology.
  1. the process whereby an irregular land surface is made flat or level by erosion.
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Origin of planation

First recorded in 1875–80; plane1 + -ation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for planation

planation

noun
  1. the erosion of a land surface until it is basically flat
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012