Definition of bedrock noun from the Oxford Advanced American Dictionary

     

    bedrock

     noun
    noun
    NAmE//ˈbɛdrɑk//
     
     
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  1. 1 [singular] a strong base for something, especially the facts or the principles on which it is based Poor urban areas traditionally formed the bedrock of the candidate's support. Honesty is the bedrock of any healthy relationship.
  2. 2[uncountable] the solid rock in the ground below the loose soil and sand
See the Oxford Advanced Learner's Dictionary entry: bedrock