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kernel

noun [C] (IMPORTANT PART)
 
 
/ˈkɜː.nəl/ US  /ˈkɝː-/

Definition

the most important part of something, although it might not always be easy to find: There is often a kernel of truth in what they say.Important and essential thingsInformation and messages
(Definition of kernel noun (IMPORTANT PART) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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