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English definition of “cornerstone”

cornerstone

noun [C] (STONE IN BUILDING)   /ˈkɔr·nərˌstoʊn/
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.
(Definition of cornerstone noun (STONE IN BUILDING) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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