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English Lexicon

nucleus

/ˈnjuːkliəs/
nounCEFR B2 (Upper)Top #2500 frequency
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Comprehensive Definitions & Senses

1 sense
As noun
  1. 1

    The central and most important part of an object, movement, or group, forming the basis for its activity and growth.

    "This small group of volunteers formed the nucleus of the new organization."
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Synonyms (2)

Linguistic Origin & Historical Etymology

From Latin nucleus 'kernel', diminutive of nux 'nut'.

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