bedrock bedrock /ˈbɛˌdrɑːk/

noun

1. Principles from which other truths can be derived  ( basic principle , basics , bedrock , fundamental principle , fundamentals )
   principles from which other truths can be derived
    First you must learn the fundamentals
   first you must learn the fundamentals
    Let's get down to basics
   let's get down to basics
   
2. Solid unweathered rock lying beneath surface deposits of soil  ( bedrock )
   solid unweathered rock lying beneath surface deposits of soil
    The foundation of the building was anchored deep into the bedrock for stability.
   The foundation of the building was anchored deep into the bedrock for stability.