4. (noun)kernel, substance, core, center, centre, essence, gist, heart, heart and soul, inwardness, marrow, meat, nub, pith, sum, nitty-gritty the choicest or most essential or most vital part of some idea or experience "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"
8. (noun)core, magnetic core (computer science) a tiny ferritetoroid formerly used in a random accessmemory to store one bit of data; now superseded by semiconductor memories "each core has three wires passing through it, providing the means to select and detect the contents of each bit"
3. (noun)core a Hebrew dry measure; a cor or homer
4. (noun)core the heart or inner part of a thing, as of a column, wall, rope, of a boil, etc.; especially, the centralpart of fruit, containing the kernels or seeds; as, the core of an apple or quince
5. (noun)core the center or inner part, as of an open space; as, the core of a square
6. (noun)core the most important part of a thing; the essence; as, the core of a subject
7. (noun)core the prtion of a mold which shapes the interior of a cylinder, tube, or other hollow casting, or which makes a hole in or through a casting; a part of the mold, made separate from and inserted in it, for shaping some part of the casting, the form of which is not determined by that of the pattern
Definition of core 
