| core | a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil |
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| core | the chamber of a nuclear reactor containing the fissile material where the reaction takes place |
| core | the choicest or most essential or most vital part of some idea or experience |
| core | the central meaning or theme of a speech or literary work |
| core | a small group of indispensable persons or things |
| core | the center of an object |
| core | the central part of the earth |
| core | a cylindrical sample of soil or rock obtained with a hollow drill |
| core | remove the core or center from |
| core | an organization founded by James Leonard Farmer in 1942 to work for racial equality |
| core | an annular drilling bit to allow core samples to be taken |
| core | (computer science) dump of the contents of the chief registers in the CPU |