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English definition of “keystone”

keystone

noun [C]
 
 
/ˈkiːstəʊn/
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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