Usually means: Brain injury from impact, shaking.
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We found 48 dictionaries that define the word concussion:

General (25 matching dictionaries)
  1. concussion: Merriam-Webster.com
  2. concussion: Oxford Learner's Dictionaries
  3. concussion: American Heritage Dictionary of the English Language
  4. concussion: Collins English Dictionary
  5. concussion: Vocabulary.com
  6. Concussion, concussion: Wordnik
  7. concussion: Cambridge Advanced Learner's Dictionary
  8. concussion: Wiktionary
  9. concussion: Webster's New World College Dictionary, 4th Ed.
  10. concussion: The Wordsmyth English Dictionary-Thesaurus
  11. concussion: Infoplease Dictionary
  12. concussion: Dictionary.com
  13. concussion: Online Etymology Dictionary
  14. concussion: Cambridge Essential American English Dictionary
  15. Concussion (album), Concussion (disambiguation), Concussion (film), Concussion: Wikipedia, the Free Encyclopedia
  16. Concussion: Online Plain Text English Dictionary
  17. concussion: Webster's Revised Unabridged, 1913 Edition
  18. concussion: Rhymezone
  19. Concussion: AllWords.com Multi-Lingual Dictionary
  20. concussion: Webster's 1828 Dictionary
  21. concussion: Free Dictionary
  22. concussion: Mnemonic Dictionary
  23. concussion: Dictionary/thesaurus

Business (2 matching dictionaries)
  1. Bouvier's Law Dictionary 1856 Edition (No longer online)
  2. concussion: Legal dictionary

Computing (1 matching dictionary)
  1. concussion: Encyclopedia

Medicine (16 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Concussion: MedTerms.com Medical Dictionary
  3. Concussion: Merck Manuals
  4. online medical dictionary (No longer online)
  5. Probert Encyclopaedia of Medicine (No longer online)
  6. National MCH Center for Child Death Review (No longer online)
  7. Concussion: MEDLINE plus Illustrated Medical Encyclopedia
  8. Neurotrauma Glossary (No longer online)
  9. concussion: Parents' Common Sense Encyclopedia
  10. A-Z Family health glossary (No longer online)
  11. concussion: Medical dictionary
  12. Rudy's List of Archaic Medical Terms (No longer online)
  13. University of Maryland Glossary of Medical Terms (No longer online)
  14. Concussion: Brain Injury
  15. Concussion: Drug Medical Dictionary
  16. Hyperdictionary (No longer online)

Miscellaneous (2 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. Brilliant Dream Dictionary (No longer online)

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

Sports (1 matching dictionary)
  1. Concussion: Sports Definitions

(Note: See concussions as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (obsolete, seismology) A violent collision or shock.
noun:  (uncountable in Commonwealth, countable in Canada, US) An injury to part of the body, most especially the brain, caused by a violent blow, followed by loss of function.
noun:  (obsolete, law) The unlawful forcing of another by threats of violence to yield up something of value.

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