base level

American  

noun

Geology.

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

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base level British  

noun

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

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Etymology

Origin of base level

First recorded in 1870–75

Example Sentences

"That was the idea: to create confusion and generate skepticism at the base level by distorting certain elements of real things."

From Barron's • Jan. 20, 2026

Emma Raducanu is hoping to develop a better base level in 2026 so she can dictate matches more frequently and worry less about the strengths of her opponent.

From BBC • Dec. 2, 2025

On a base level, these two friends make mistakes and are there to help each other clean them up; Helen and Sam just happen to be spies, too.

From Salon • Dec. 11, 2024

At a base level, buildings are fortified with thicker beams, pillars, and walls to better withstand shaking.

From National Geographic • Jan. 4, 2024

“If you’d died, that would’ve been a black mark on my reputation, so yes, at some base level, I was...worried.”

From "Aru Shah and the End of Time" by Roshani Chokshi