Longman Dictionary of Contemporary English homepage

bedrock

 noun
     
Related topics: Geology
bed‧rock
1 [singular] the basic ideas, features, or facts on which something is based:
Marriage and children are the bedrock of family life.
2HEG [uncountable] solid rock in the ground below soil or sand
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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