principle a basic truth or law or assumption; "the principles of democracy"
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Wiktionary
Substantiv
bedrock -
The solidrock that exists at some depth below the groundsurface. Bedrock is rock "in place", as opposed to material that has been transported from another location by weathering and erosion.
Bedrock is the native consolidated rock underlying the surface of a terrestrial planet, usually the Earth. Above the bedrock is usually an area of broken and weathered unconsolidated rock in the basal subsoil. The top of the bedrock is known as rockhead and identifying this, via excavations, drilling or geophysical methods, is an important task in most civil engineering projects.