Dictionary

The central part of fruit, containing the kernels or seeds.

Example: the core of an apple or quince

The heart or inner part of a physical thing

The center or inner part of a space or area

Example: the core of a square

The most important part of a thing; the essence.

Example: the core of a subject

To remove the core of an apple or other fruit.

To extract a sample with a drill.

A body of individuals; an assemblage.

A miner's underground working time or shift.

Various former units of volume, particularly:

(machinery, marine) 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.