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base level

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noun Geology.
  1. the lowest level to which running water can erode the land.

Origin of base level

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for base level

base level

noun
  1. the lowest level to which a land surface can be eroded by streams, which is, ultimately, sea level
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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