Usually means: Severe overheating of nuclear reactor.
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We found 28 dictionaries that define the word meltdown:

General (20 matching dictionaries)
  1. meltdown: Merriam-Webster.com
  2. meltdown: Oxford Learner's Dictionaries
  3. meltdown: American Heritage Dictionary of the English Language
  4. meltdown: Collins English Dictionary
  5. meltdown: Vocabulary.com
  6. Meltdown, meltdown: Wordnik
  7. meltdown: Cambridge Advanced Learner's Dictionary
  8. meltdown: Wiktionary
  9. meltdown: Webster's New World College Dictionary, 4th Ed.
  10. meltdown: The Wordsmyth English Dictionary-Thesaurus
  11. meltdown: Infoplease Dictionary
  12. meltdown: Dictionary.com
  13. meltdown: Cambridge Essential American English Dictionary
  14. Meltdown (Ash album), Meltdown (Clearfield and Tilcsik book), Meltdown (EP), Meltdown (GrimSkunk album), Meltdown (Icehouse album), Meltdown (Image Comics), Meltdown (JAG), Meltdown (Love and Death song), Meltdown (Massacre album), Meltdown (Red Dwarf), Meltdown (Steve Taylor album), Meltdown (Stromae song), Meltdown (Vinnie Moore album), Meltdown (Woods book), Meltdown (festival), Meltdown (security bug), Meltdown (security vulnerability), Meltdown: Wikipedia, the Free Encyclopedia
  15. meltdown: Rhymezone
  16. meltdown: Free Dictionary
  17. meltdown: Mnemonic Dictionary
  18. meltdown: Dictionary/thesaurus

Business (2 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. BusinessDictionary.com (No longer online)

Computing (4 matching dictionaries)
  1. meltdown: Free On-line Dictionary of Computing
  2. meltdown: Netlingo
  3. meltdown: Computer Telephony & Electronics Dictionary and Glossary
  4. Meltdown (disambiguation), meltdown: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

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

(Note: See meltdowns as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  Severe overheating of the core of a nuclear reactor resulting in the core melting and potentially in radiation escaping.
noun:  A situation being likened to a nuclear meltdown; a crisis.
noun:  (informal) A tantrum or emotional outburst.
noun:  (psychology) An autistic response to stress or sensory overload, in which the person is overwhelmed by intense, seemingly disproportionate emotions, behaving erratically and becoming unable to mask.

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