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core (n.)

early 14c., "heart or inmost part of anything" (especially an apple, pear, etc.), of uncertain origin, probably from Old French cor, coeur "core of fruit, heart of lettuce," literally "heart," from Latin cor "heart," from PIE root *kerd- "heart."

Meaning "a central portion cut and removed" (as from a tree, soil, etc.) is from 1640s. Meaning "internal mold of a casting, which fills the space intended to be left hollow" is from 1730. Nuclear physics sense "portion of a reactor containing the nuclear fuel and where the reactions take place" is from 1949.

core (v.)

"to remove the core of" (a fruit), mid-15c., from core (n.). Related: Cored; coring.

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Definitions of core from WordNet
1
core (n.)
a small group of indispensable persons or things;
five periodicals make up the core of their publishing program
Synonyms: nucleus / core group
core (n.)
the center of an object;
the ball has a titanium core
core (n.)
the central part of the Earth;
core (n.)
the choicest or most essential or most vital part of some idea or experience;
Synonyms: kernel / substance / center / centre / essence / gist / heart / heart and soul / inwardness / marrow / meat / nub / pith / sum / nitty-gritty
core (n.)
a cylindrical sample of soil or rock obtained with a hollow drill;
core (n.)
an organization founded by James Leonard Farmer in 1942 to work for racial equality;
Synonyms: Congress of Racial Equality
core (n.)
the central meaning or theme of a speech or literary work;
Synonyms: effect / essence / burden / gist
core (n.)
(computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories;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
Synonyms: magnetic core
core (n.)
the chamber of a nuclear reactor containing the fissile material where the reaction takes place;
core (n.)
a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil;
2
core (v.)
remove the core or center from;
core an apple
From wordnet.princeton.edu