Lucid Lexicon

underworld

circa 1600, "the lower world, Hades, place of departed souls," also "the earth, the world below the skies"

The word was expanded by added meanings:
1890, "lower level of society"
1900, "criminals and organized crime collectively"

underworld noun

archaic: The Earth
the place of departed souls: Hades
the parts of the earth diametrically opposite: antipodes
Avernus ("Birdless")
- The entrance to Hell (see hellgate) or the underworld, or the underworld itself.
Di inferi or dii inferi (Latin, "the gods below") were a shadowy collective of ancient Roman deities associated with death and the underworld. The epithet inferi is also given to Di Manes.

"Yes. The world of illusions. The world you know as the one and only world. That is the underworld."

"Originals"
(Speed Well Dialogues)
by Sabina Nore

chthonian adjective
of or relating to the deities, spirits, and other beings dwelling under the earth.

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~☉~	lucid definition; added layer of lucidity, or aethereal context
⚜	classic definition
☣	artificium definition; usually words which have undergone a warped evolution, or a complete perversion of the original sense