Meaning of “keystone” in the English Dictionary

"keystone" in British English

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keystonenoun [ C ]

uk /ˈkiː.stəʊn/ us /ˈkiː.stoʊn/

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

"keystone" in Business English

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keystonenoun [ C ]

uk /ˈkiːstəʊn/ us

the most important part of a plan, idea, etc. on which everything else depends:

Selling overseas has been, and always will remain, one of the keystones of our national prosperity.
A keystone of its corporate strategy is to invest in people, technology, and training to create a brand.

(Definition of “keystone” from the Cambridge Business English Dictionary © Cambridge University Press)

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