Meaning of “cornerstone” in the English Dictionary

"cornerstone" in English

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cornerstonenoun [ C ]

uk /ˈkɔː.nə.stəʊn/ us /ˈkɔːr.nɚ.stoʊn/

(Definition of “cornerstone” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"cornerstone" in American English

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cornerstonenoun [ C ]

us /ˈkɔr·nərˌstoʊn/

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)