Core definition

Probably from coeur, from "cor" meaning "heart".

A body of individuals; an assemblage.
A miner's underground working time or shift.
A Hebrew dry measure; a cor or homer.
The central part of fruit, containing the kernels or seeds; as, the core of an apple or quince.
The heart or inner part of a thing, as of a column, wall, rope, of a boil, etc.
The center or inner part, as of an open space; as, the core of a square.
The most important part of a thing; the essence; as, the core of a subject.
The portion of a mold that creates an internal cavity within a casting or that makes a hole in or through a casting.
A disorder of sheep caused by worms in the liver.
The bony process which forms the central axis of the horns in many animals.
magnetic memory.
One of several parts in a computer processor.
A deposit paid by the purchaser of a rebuilt part, to be refunded on return of a used, rebuildable part, or the returned rebuildable part itself. Said to be an acronym for Cash On REturn, but that may be a backronym.