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English definition of “nucleus”

nucleus

noun [C]     /ˈnjuːkliəs/ (plural nuclei /ˈnjuːkliaɪ/)
ATOM OR CELL the central part of an atom or cellCellsAtoms, molecules and sub-atomic particles
IMPORTANT PART the central or most important part of a group or idea: Senior coaches handpicked the nucleus of the team.Important and essential thingsInformation and messages
(Definition of nucleus noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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