[pee-nuh-pleyn, pee-nuh-pleyn]
noun Geology.
an area reduced almost to a plain by erosion.
Also, peneplane.

1885–90; pene- + plain1

peneplanation [pee-nuh-pluh-ney-shuhn] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peneplain or peneplane (ˈpiːnɪˌpleɪn, ˌpiːnɪˈpleɪn, ˈpiːnɪˌpleɪn, ˌpiːnɪˈpleɪn)
a relatively flat land surface produced by a long period of erosion
[C19: from pene- + plain1]
peneplane or peneplane
[C19: from pene- + plain1]
penepla'nation or peneplane

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Through a long era of relative crustal stability the old mountains were eroded to a vast plain, or peneplain, close to sea-level.
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