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cornerstone

 
/ˈkɔr·nərˌstoʊn/ n [C] (MOST IMPORTANT PART)

Definition

something of great importance on which everything else depends: Funds for the school system were the cornerstone of his budget proposal. All the parties to the dispute agree that ready access to the law is a cornerstone of democracy.
(Definition of cornerstone n (MOST IMPORTANT PART) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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