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English definition of “core”

core

noun (IMPORTANT PART)    /kɔːr/ US  /kɔːr/
C2 [S or U] the basic and most important part of something: The lack of government funding is at the core of the problem .Places and locationsUnpleasant placesCentres of objectsImportant and essential thingsInformation and messages
(Definition of core noun (IMPORTANT PART) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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