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From The Collaborative International Dictionary of English v.0.48:
Underworld \Un"der*world`\, n. 1. The lower of inferior world; the world which is under the heavens; the earth. [1913 Webster] That overspreads (with such a reverence) This underworld. --Daniel. [1913 Webster] 2. The mythological place of departed souls; Hades. [1913 Webster] 3. The portion of the world which is below the horizon; the opposite side of the world; the antipodes. [R.] [1913 Webster] Fresh as the first beam glittering on a sail, That brings our friends up from the underworld. --Tennyson. [1913 Webster] 4. The inferior part of mankind. [R.] --Atterbury. [1913 Webster]