cornerstone Meaning in the Cambridge English Dictionary
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Meaning of “cornerstone” in the English Dictionary

"cornerstone" in British English

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cornerstonenoun [C]

uk   /ˈkɔː.nə.stəʊn/  us   /ˈkɔːr.nɚ.stoʊn/
a ​stone in a ​corner of a ​building, ​especially one with the ​date when the ​building was made or other writing on it something of ​greatimportance that everything ​elsedepends on: In most ​countries, the ​familyunit is still the cornerstone of ​society.
(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 ​largestone near the ​base of a ​building where two ​wallsmeet, often giving ​information about the ​building and sometimes put in ​position with a ​ceremony: A ​largegroup of ​officialsattended a cornerstone ​laying at that new ​plant.

cornerstone noun [C] (MOST IMPORTANT PART)

something of ​greatimportance on which everything ​elsedepends: Funds for the ​schoolsystem were the cornerstone of his ​budgetproposal. All the ​parties to the ​disputeagree that ​readyaccess to the ​law is a cornerstone of ​democracy.
(Definition of cornerstone from the Cambridge Academic Content Dictionary © Cambridge University Press)
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