Usually means: Occurring without external cause, unplanned.
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We found 32 dictionaries that define the word spontaneous:

General (26 matching dictionaries)
  1. spontaneous: Merriam-Webster.com
  2. spontaneous: Oxford Learner's Dictionaries
  3. spontaneous: American Heritage Dictionary of the English Language
  4. spontaneous: Collins English Dictionary
  5. spontaneous: Vocabulary.com
  6. Spontaneous, spontaneous: Wordnik
  7. spontaneous: Cambridge Advanced Learner's Dictionary
  8. spontaneous: Wiktionary
  9. spontaneous: Webster's New World College Dictionary, 4th Ed.
  10. spontaneous: The Wordsmyth English Dictionary-Thesaurus
  11. spontaneous: Infoplease Dictionary
  12. spontaneous: Dictionary.com
  13. spontaneous: Online Etymology Dictionary
  14. spontaneous: Cambridge Essential American English Dictionary
  15. Spontaneous (film), Spontaneous: Wikipedia, the Free Encyclopedia
  16. Spontaneous: Online Plain Text English Dictionary
  17. spontaneous: Webster's Revised Unabridged, 1913 Edition
  18. spontaneous: Rhymezone
  19. spontaneous: AllWords.com Multi-Lingual Dictionary
  20. spontaneous: Webster's 1828 Dictionary
  21. spontaneous: Free Dictionary
  22. spontaneous: Mnemonic Dictionary
  23. spontaneous: LookWAYup Translating Dictionary/Thesaurus
  24. spontaneous: Dictionary/thesaurus

Business (1 matching dictionary)
  1. spontaneous: Legal dictionary

Computing (1 matching dictionary)
  1. spontaneous: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. spontaneous: Medical dictionary

Science (1 matching dictionary)
  1. General Chemistry Online (No longer online)

Slang (1 matching dictionary)
  1. spontaneous: Urban Dictionary

(Note: See spontaneously as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Self-generated; happening without any apparent external cause.
adjective:  Done by one's own free choice, or without planning.
adjective:  Proceeding from natural feeling or native tendency without external or conscious constraint.
adjective:  Arising from a momentary impulse.
adjective:  Controlled and directed internally; self-active; spontaneous movement characteristic of living things.
adjective:  Produced without being planted or without human cultivation or labor.
adjective:  Random.
adjective:  Sudden, without warning.

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Colors:
    orange,     yellow,     lime green,     turquoise,     magenta, more...



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