bedrock

bed|rock /b'edrɒk/
1 [N-SING]
The bedrock of something is the principles, ideas, or facts on which it is based.
Mutual trust is the bedrock of a relationship...
...the bedrock principles of British democratic socialism.
= foundation
2 [N-UNCOUNT]
Bedrock is the solid rock in the ground which supports all the soil above it.

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