abyss

noun

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.

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