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English definition of “core”

core

noun     /kɔːr/
IMPORTANT PART [no plural] the most important part of a system or principle: core values Better health care was at the core of the senator's campaign.Important and essential thingsInformation and messages
FRUIT [C] the hard, central part of certain fruits, such as apples, which contains the seedsFruits and seeds and their parts
PLANET [no plural] the centre of a planet: the Earth's core → See also hard coreCentres of objects
(Definition of core noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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