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English definition of “cornerstone”

cornerstone

noun [C]  /ˈkɔr·nərˌstoʊn/ us  

cornerstone noun [C] (STONE IN BUILDING)

a large stone near the base of a building where two walls meet, often giving information about the building and sometimes put in position with a ceremony: A large group of officials attended a cornerstone laying at that new plant.

cornerstone noun [C] (MOST IMPORTANT PART)

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 from the Cambridge Academic Content Dictionary © Cambridge University Press)
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