Also found in: Idioms.
1. The most central and material part:
core, essence, gist, heart, kernel, marrow, meat, nub, pith, quintessence, soul, spirit, stuff, substance.
2. A fundamental principle or underlying concept:
3. A point of origination:
4. A point of origin from which ideas or influences, for example, originate:
1. To implant so deeply as to make change nearly impossible: