an area reduced almost to a plain by erosion.
- pe·ne·pla·na·tion [pee-nuh-pluh-ney-shuhn], /ˌpi nə pləˈneɪ ʃən/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use peneplain in a sentence
The bottoms of the broad depressions represent the Shenandoah peneplain, which is sharply trenched by the modern river channels.
This peneplain was later upraised into a plateau and its downward inclination towards the east increased.
The suggestion has been offered that the northern portion of the Coast Range is a dissected peneplain.
In other words, the western slope is a tilted peneplain, bearing on its surface remnants of older uplands.
Immense regional intrusions, the cores of once lofty mountain ranges, are found upon the Laurentian peneplain.The Elements of Geology | William Harmon Norton
British Dictionary definitions for peneplain
a relatively flat land surface produced by a long period of erosion
- peneplanation, noun
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