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planation

[pley-ney-shuh n, pluh-] /pleɪˈneɪ ʃən, plə-/
noun, Geology
1.
the process whereby an irregular land surface is made flat or level by erosion.
Origin
1875-1880
1875-80; plane1 + -ation
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for planation

planation

/pleɪˈneɪʃən/
noun
1.
the erosion of a land surface until it is basically flat
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
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