(noun, verb)


1. a small group of indispensable persons or things

- five periodicals make up the core of their publishing program

Similar word(s): nucleus

Definition categories: group, set

2. the center of an object

- the ball has a titanium core

Definition categories: location, center, centre, midpoint

3. the central part of the Earth

Definition categories: object, center, centre, midpoint

4. the choicest or most essential or most vital part of some idea or experience

Similar word(s): center, centre, essence, gist, heart, inwardness, kernel, marrow, meat, nub, pith, substance, sum

Definition categories: thought, content

5. a cylindrical sample of soil or rock obtained with a hollow drill

Definition categories: object, sample

6. an organization founded by James Leonard Farmer in 1942 to work for racial equality

Definition categories: group

7. the central meaning or theme of a speech or literary work

Similar word(s): burden, effect, essence, gist

Definition categories: communication, import, meaning, significance, signification

8. (computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories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

Definition categories: man–made, toroid, torus

9. the chamber of a nuclear reactor containing the fissile material where the reaction takes place

Definition categories: man–made, chamber

10. a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil

Definition categories: man–made, bar

Sentences with core as a noun:

- the core of an apple or quince

- the core of a subject

- I wanted to play a particular computer game, which required I buy a new computer, so while the game said it needed at least a dual-core processor, I wanted my computer to be a bit ahead of the curve, so I bought a quad-core.

- a floor panel with a Nomex honeycomb core


1. remove the core or center from

- core an apple

Definition categories: contact, hollow