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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 (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 (2 matching dictionaries)

33. UNKNOWN: Bouvier's Law Dictionary 1856 Edition [home, info]
34. unknown: Legal dictionary [home, info]

Computing (1 matching dictionary)

35. unknown: Encyclopedia [home, info]

Miscellaneous (3 matching dictionaries)

36. unknown: Encyclopedia of Graphic Symbols [home, info]
37. Unknown: Brilliant Dream Dictionary [home, info]
38. unknown: Idioms [home, info]

Science (2 matching dictionaries)

39. Unknown, unknown: Botanical Name listing of Plants [home, info]
40. Unknown: Eric Weisstein's World of Mathematics [home, info]

Slang (1 matching dictionary)

41. unknown: Urban Dictionary [home, info]

Tech (1 matching dictionary)

42. unknown: DOD Dictionary of Military Terms [home, info]

(Note: See unknowns for more definitions.)

Quick definitions from Macmillan ( ) Provided by 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") ▸ Also see unknowns ▸ Word origin ▸ Words similar to unknown ▸ Usage examples for unknown ▸ Idioms related to unknown (New!) ▸ Popular adjectives describing unknown ▸ Popular nouns described by unknown ▸ Words that often appear near unknown ▸ Rhymes of unknown ▸ Invented words related to unknown