Usually means: Beneath the surface of earth.
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We found 37 dictionaries that define the word underground:

General (27 matching dictionaries)
  1. underground: Longman Dictionary of Contemporary English
  2. underground, the underground: Merriam-Webster
  3. underground, underground, the Underground: Oxford Learner's Dictionaries
  4. underground: American Heritage Dictionary of the English Language
  5. underground, the underground: Collins English Dictionary
  6. underground: Vocabulary.com
  7. Underground, underground: Wordnik
  8. underground, the underground: Cambridge Advanced Learner's Dictionary
  9. Underground, underground: Wiktionary
  10. underground: Webster's New World College Dictionary, 4th Ed.
  11. underground: The Wordsmyth English Dictionary-Thesaurus
  12. underground: Infoplease Dictionary
  13. underground: Dictionary.com
  14. underground (adv.): Online Etymology Dictionary
  15. underground: Cambridge Essential American English Dictionary
  16. 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
  17. Underground: Online Plain Text English Dictionary
  18. underground: Webster's Revised Unabridged, 1913 Edition
  19. underground: Rhymezone
  20. underground: AllWords.com Multi-Lingual Dictionary
  21. underground: Webster's 1828 Dictionary
  22. underground: FreeDictionary.org
  23. underground: Mnemonic Dictionary
  24. The Underground, underground: TheFreeDictionary.com
  25. 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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