Abyss meaning : Hell; the bottomless pit; primeval chaos; a confined subterranean ocean. (frequently figurative) A bottomless or unfathomed depth, gulf, or chasm; hence, any deep, immeasurable; any void space. Anything infinite, immeasurable, or profound. Moral depravity; vast intellectual or moral depth. An impending catastrophic happening. The center of an escutcheon. The abyssal zone. A difference, especially a large difference, between groups.