- Archaic the earth
- the mythical world of the dead; Hades
- the opposite side of the earth; antipodes
- the criminal members of society, or people living by vice or crime, regarded as a group or class
- a. The world of the dead in various religious traditions, located below the world of the living.b. A region, realm, or dwelling place conceived to be below the surface of the earth.c. Archaic The world beneath the heavens; the earth.
- The part of society that is engaged in and organized for the purpose of crime and vice.
- Alternative capitalization of underworld.