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We found 40 dictionaries with English definitions that include the word underground:
Click on the first link on a line below to go directly to a page where "underground" is defined.

General (30 matching dictionaries)

1. underground, the underground: Merriam-Webster.com [home, info]
2. underground, underground, the Underground: Oxford Learner's Dictionaries [home, info]
3. underground: American Heritage Dictionary of the English Language [home, info]
4. underground, the underground: Collins English Dictionary [home, info]
5. underground: Vocabulary.com [home, info]
6. underground, underground, the Underground: Macmillan Dictionary [home, info]
7. Underground, underground: Wordnik [home, info]
8. underground, the underground: Cambridge Advanced Learner's Dictionary [home, info]
9. Underground, underground: Wiktionary [home, info]
10. underground: Webster's New World College Dictionary, 4th Ed. [home, info]
11. underground: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. underground: Infoplease Dictionary [home, info]
13. underground: Dictionary.com [home, info]
14. underground (adv.): Online Etymology Dictionary [home, info]
15. Underground, underground: UltraLingua English Dictionary [home, info]
16. underground: Cambridge Dictionary of American English [home, info]
17. 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 [home, info]
18. Underground: Online Plain Text English Dictionary [home, info]
19. underground: Webster's Revised Unabridged, 1913 Edition [home, info]
20. underground: Rhymezone [home, info]
21. underground: AllWords.com Multi-Lingual Dictionary [home, info]
22. underground: Webster's 1828 Dictionary [home, info]
23. underground: Free Dictionary [home, info]
24. underground: Mnemonic Dictionary [home, info]
25. underground: WordNet 1.7 Vocabulary Helper [home, info]
26. underground: LookWAYup Translating Dictionary/Thesaurus [home, info]
27. The Underground, underground: Dictionary/thesaurus [home, info]
28. Underground (song): Wikipedia, the Free Encyclopedia [home, info]

Business (3 matching dictionaries)

29. Underground: Construction Term Glossary [home, info]
30. The Underground, Underground (album), Underground (disambiguation), underground: Legal dictionary [home, info]
31. underground: Financial dictionary [home, info]

Computing (1 matching dictionary)

32. The Underground, Underground (album), Underground (disambiguation), underground: Encyclopedia [home, info]

Medicine (1 matching dictionary)

33. underground: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

34. underground: Political [home, info]
35. Underground: Brilliant Dream Dictionary [home, info]

Slang (2 matching dictionaries)

36. The Underground: A Seattle Lexicon [home, info]
37. The UnderGround: Urban Dictionary [home, info]

Tech (1 matching dictionary)

38. underground: Rane Professional Audio Reference [home, info]

(Note: See undergrounds for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (underground) ▸ noun:  a secret group organized to overthrow a government or occupation force ▸ noun:  electric underground railway ▸ adjective:  conducted with or marked by hidden aims or methods ("Underground resistance") ▸ adjective:  under the level of the ground ("Underground caverns") ▸ adjective:  used of independent armed resistance forces ▸ adverb:  beneath the surface of the earth ("Water flowing underground") ▸ adverb:  in or into hiding or secret operation ("The organization was driven underground") ▸ Also see undergrounds ▸ Word origin ▸ Words similar to underground ▸ Usage examples for underground ▸ Idioms related to underground (New!) ▸ Popular adjectives describing underground ▸ Popular nouns described by underground ▸ Words that often appear near underground ▸ Rhymes of underground ▸ Invented words related to underground