core core /ˈkɔr/

noun

1. () A small group of indispensable persons or things  ( core group , nucleus , core )
   a small group of indispensable persons or things
    Five periodicals make up the core of their publishing program
   five periodicals make up the core of their publishing program
   
   
2. () The center of an object  ( core )
   the center of an object
    The ball has a titanium core
   the ball has a titanium core
   
3. () The choicest or most essential or most vital part of some idea or experience  ( centre [Canadian, British] , gist , heart and soul , inwardness , kernel , marrow , meat , nitty-gritty , nub , center [American] , core , essence , heart , pith , substance , sum )
   the choicest or most essential or most vital part of some idea or experience
    The gist of the prosecutor's argument
   the gist of the prosecutor's argument
    The heart and soul of the Republican Party
   the heart and soul of the Republican Party
    The nub of the story
   the nub of the story
   
4. () The central part of the Earth  ( core )
   the central part of the Earth
   
5. () A cylindrical sample of soil or rock obtained with a hollow drill  ( core )
   a cylindrical sample of soil or rock obtained with a hollow drill
   
6. A bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil  ( core )
   a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil
    The transformer's efficiency was enhanced with the right magnetic core passing through its coil.
   The transformer's efficiency was enhanced with the right magnetic core passing through its coil.
   
   
7. The chamber of a nuclear reactor containing the fissile material where the reaction takes place  ( core )
   the chamber of a nuclear reactor containing the fissile material where the reaction takes place
   
8. (computing) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories  ( core , magnetic core )
   (computing) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories
    Each core has three wires passing through it, providing the means to select and detect the contents of each bit
   each core has three wires passing through it, providing the means to select and detect the contents of each bit
   
   
9. The central meaning or theme of a speech or literary work  ( burden , core , essence , effect , gist )
   the central meaning or theme of a speech or literary work
   

verb

1. () Remove the core or center from  ( core )
   remove the core or center from
    Core an apple
   core an apple
   

 CORE

noun

1. An organization founded by James Leonard Farmer in 1942 to work for racial equality  ( Congress of Racial Equality , CORE )
   an organization founded by James Leonard Farmer in 1942 to work for racial equality