- 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
Examples from the Web for base level
And, where those cannot be achieved, at least a base-level opposition to tyranny, reaction, religious fundamentalism, and so on.When Liberals Enable Tyrants
September 6, 2013
The excavation of these valleys is due to an upheaval which raised this part of the Pampa above the base-level.The Argentine Republic
No definite degree of slope can be fixed upon as marking a base-level.
At a stage shortly preceding the base-level stage the surface would be a peneplain.
A peneplain, therefore, is a surface which has been brought toward, but not to base-level.
The base-level is now 2-2, and the valley represented in the diagram has not yet reached it.
- 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