Usually means: Beneath the surface of earth.
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We found 36 dictionaries that define the word underground:

General (26 matching dictionaries)
  1. underground, the underground: Merriam-Webster.com
  2. underground, underground, the Underground: Oxford Learner's Dictionaries
  3. underground: American Heritage Dictionary of the English Language
  4. underground, the underground: Collins English Dictionary
  5. underground: Vocabulary.com
  6. Underground, underground: Wordnik
  7. underground, the underground: Cambridge Advanced Learner's Dictionary
  8. Underground, underground: Wiktionary
  9. underground: Webster's New World College Dictionary, 4th Ed.
  10. underground: The Wordsmyth English Dictionary-Thesaurus
  11. underground: Infoplease Dictionary
  12. underground: Dictionary.com
  13. underground (adv.): Online Etymology Dictionary
  14. underground: Cambridge Essential American English Dictionary
  15. The Underground (Boston), The Underground (TV series), The Underground (newspaper), The Underground (novel), The Underground (roller coaster), The Underground, The underground, Underground (Ben Folds Five song), Underground (British subculture), Underground (Chris Potter album), Underground (Courtney Pine album), Underground (David Bowie song), Underground (Dreyfus book), Underground (Electric Prunes album), Underground (Evermore song), Underground (Graham Bonnet album), Underground (Haruki Murakami book), Underground (Jayo Felony album), Underground (McGahan novel), Underground (Murakami book), Underground (Phil Keaggy album), Underground (Stargate Atlantis), Underground (Suelette Dreyfus book), Underground (TV series), Underground (The Electric Prunes album), Underground (Thelonious Monk album), Underground (disambiguation), Underground (film), Underground (play), Underground (role-playing game), Underground (soundtrack), Underground (stories), Underground: Wikipedia, the Free Encyclopedia
  16. Underground: Online Plain Text English Dictionary
  17. underground: Webster's Revised Unabridged, 1913 Edition
  18. underground: Rhymezone
  19. underground: AllWords.com Multi-Lingual Dictionary
  20. underground: Webster's 1828 Dictionary
  21. underground: Free Dictionary
  22. underground: Mnemonic Dictionary
  23. The Underground, underground: Dictionary/thesaurus
  24. Underground (song): Wikipedia, the Free Encyclopedia

Business (3 matching dictionaries)
  1. Construction Term Glossary (No longer online)
  2. The Underground, Underground (album), Underground (disambiguation), underground: Legal dictionary
  3. underground: Financial dictionary

Computing (1 matching dictionary)
  1. The Underground, Underground (album), Underground (disambiguation), underground: Encyclopedia

Medicine (1 matching dictionary)
  1. underground: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. Political (No longer online)
  2. Brilliant Dream Dictionary (No longer online)

Slang (2 matching dictionaries)
  1. The Underground: A Seattle Lexicon
  2. The UnderGround: Urban Dictionary

Tech (1 matching dictionary)
  1. Rane Professional Audio Reference (No longer online)

(Note: See undergrounding as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  (not comparable) Below the ground; below the surface of the Earth.
adjective:  (figurative) Hidden, furtive, secretive.
adjective:  (of music, art etc.) Outside the mainstream, especially unofficial and hidden from the authorities.
adverb:  Below the ground.
adverb:  Secretly.
noun:  (geography) Regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).
noun:  (chiefly British) Synonym of subway: a railway that is under the ground.
noun:  (with definite article) A movement or organisation of people who resist political convention.
noun:  (with definite article) A movement or organisation of people who resist artistic convention.
verb:  To route electricity distribution cables underground.
noun:  (UK, rail transport) The London Underground.

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Colors:
    charcoal,     graphite,     onyx,     coal,     soot, more...



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