core - definition and synonyms

noun [countable] 

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  1. 1
    the most important or most basic part of something
    core of:

    These 2,500 words form the core of the language.

    at the core of something:

    Financial instability lies at the core of the institute’s problems.

    1. a.
      the members of a group who do the most work, or who support it most strongly
      core of:

      Females comprise the core of the monkeyssocial unit.

  2. 2
    the part inside an object that is nearest its centre

    The ball has a core of hard rubber.

    core of:

    These six countries are the geographical core of Western Europe.

    1. a.
    2. b.
      the central part of a planet

      the Earth’s core

    3. c.