Definitions from Wiktionary ( )

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

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