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We found 44 dictionaries with English definitions that include the word unknown:
Click on the first link on a line below to go directly to a page where "unknown" is defined.

General dictionaries General (34 matching dictionaries)
  1. unknown, the unknown: Merriam-Webster.com [home, info]
  2. unknown, the unknown: Oxford Learner's Dictionaries [home, info]
  3. unknown: American Heritage Dictionary of the English Language [home, info]
  4. unknown: Collins English Dictionary [home, info]
  5. unknown: Vocabulary.com [home, info]
  6. unknown, unknown: Macmillan Dictionary [home, info]
  7. Unknown, unknown: Wordnik [home, info]
  8. unknown: Cambridge Advanced Learner's Dictionary [home, info]
  9. unknown: Wiktionary [home, info]
  10. unknown: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. unknown: The Wordsmyth English Dictionary-Thesaurus [home, info]
  12. unknown: Infoplease Dictionary [home, info]
  13. unknown: Dictionary.com [home, info]
  14. unknown (adj.): Online Etymology Dictionary [home, info]
  15. Unknown, unknown: UltraLingua English Dictionary [home, info]
  16. unknown: Cambridge Dictionary of American English [home, info]
  17. unknown: Cambridge International Dictionary of Idioms [home, info]
  18. The Unknown (Animorphs), The Unknown (Madeline Juno album), The Unknown (Over the Garden Wall), The Unknown (The Vision Bleak album), The Unknown (novel), Unknown (Rasputina album), Unknown (Tekken), Unknown (magazine), Unknown (mathematics), Unknown (video game), Unknown: Wikipedia, the Free Encyclopedia [home, info]
  19. Unknown: Online Plain Text English Dictionary [home, info]
  20. unknown: Webster's Revised Unabridged, 1913 Edition [home, info]
  21. unknown: Rhymezone [home, info]
  22. unknown: AllWords.com Multi-Lingual Dictionary [home, info]
  23. unknown: Webster's 1828 Dictionary [home, info]
  24. Unknown: E Cobham Brewer, The Reader's Handbook [home, info]
  25. unknown: Stammtisch Beau Fleuve Acronyms [home, info]
  26. Unknown: Dictionary of Phrase and Fable (1898) [home, info]
  27. unknown: Free Dictionary [home, info]
  28. unknown: Mnemonic Dictionary [home, info]
  29. unknown: WordNet 1.7 Vocabulary Helper [home, info]
  30. unknown: LookWAYup Translating Dictionary/Thesaurus [home, info]
  31. unknown: Dictionary/thesaurus [home, info]
  32. unknown: Wikimedia Commons US English Pronunciations [home, info]

Business dictionaries Business (2 matching dictionaries)
  1. UNKNOWN: Bouvier's Law Dictionary 1856 Edition [home, info]
  2. unknown: Legal dictionary [home, info]

Computing dictionaries Computing (1 matching dictionary)
  1. unknown: Encyclopedia [home, info]

Miscellaneous dictionaries Miscellaneous (3 matching dictionaries)
  1. unknown: Encyclopedia of Graphic Symbols [home, info]
  2. Unknown: Brilliant Dream Dictionary [home, info]
  3. unknown: Idioms [home, info]

Science dictionaries Science (2 matching dictionaries)
  1. Unknown, unknown: Botanical Name listing of Plants [home, info]
  2. Unknown: Eric Weisstein's World of Mathematics [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. unknown: Urban Dictionary [home, info]

Tech dictionaries Tech (1 matching dictionary)
  1. unknown: DOD Dictionary of Military Terms [home, info]

(Note: See unknowns for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (unknown)

noun:  a variable whose values are solutions of an equation
noun:  an unknown and unexplored region ("They came like angels out the unknown")
noun:  anyone who does not belong in the environment in which they are found
adjective:  not known ("An unknown amount")
adjective:  not known to exist
adjective:  not known before ("Don't let anyone unknown into the house")
adjective:  not famous or acclaimed
adjective:  being or having an unknown or unnamed source ("A poem by an unknown author")

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Phrases that include unknown:   unknown soldier, fever of unknown origin, great unknown, unknown unknown, hiv associated fever of unknown origin, more...

Words similar to unknown:   alien, nameless, obscure, strange, stranger, unidentified, unnamed, unsung, terra incognita, unknown quantity, unknown region, more...

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