Meaning

noun a small group of indispensable persons or things

noun the center of an object

noun the central part of the Earth

originFrom Middle English core, kore, coor (“apple-core, pith”), of obscure and uncertain origin. Possibly of native English origin, from Old English *cor, related to Old English *coruc, *corc (diminutive) (> Middle English cork, crok (“core of an apple or other fruit, heart of an onion”)) and Old English corn (“seed", also "grain”); or alternatively perhaps from Old French cuer (“heart”), from Latin…

Etymology from Wiktionary, CC BY-SA 3.0