BEDROCK

fundamentals, basics, fundamental principle, basic principle, bedrock

(noun) principles from which other truths can be derived; “first you must learn the fundamentals”; “let’s get down to basics”

bedrock

(noun) solid unweathered rock lying beneath surface deposits of soil

Source: WordNet® 3.1

Etymology

Noun

bedrock (countable and uncountable, plural bedrocks)

(uncountable, geology, mining, engineering, construction) The solid rock that exists at some depth below the ground surface. Bedrock is rock "in place", as opposed to material that has been transported from another location by weathering and erosion.

A basis or foundation.

Usage notes

In mountainous regions, bedrock can be seen at the surface. However, these occurrences are more properly called outcrops. In construction and engineering, it is often desired to place foundations on bedrock in order to improve the stability of a structure.