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We found 51 dictionaries with English definitions that include the word concussion:
Click on the first link on a line below to go directly to a page where "concussion" is defined.

General (29 matching dictionaries)

1. concussion: Merriam-Webster.com [home, info]
2. concussion: Oxford Learner's Dictionaries [home, info]
3. concussion: American Heritage Dictionary of the English Language [home, info]
4. concussion: Collins English Dictionary [home, info]
5. concussion: Vocabulary.com [home, info]
6. concussion: Macmillan Dictionary [home, info]
7. Concussion, concussion: Wordnik [home, info]
8. concussion: Cambridge Advanced Learner's Dictionary [home, info]
9. concussion: Wiktionary [home, info]
10. concussion: Webster's New World College Dictionary, 4th Ed. [home, info]
11. concussion: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. concussion: Infoplease Dictionary [home, info]
13. concussion: Dictionary.com [home, info]
14. concussion: Online Etymology Dictionary [home, info]
15. concussion: UltraLingua English Dictionary [home, info]
16. concussion: Cambridge Dictionary of American English [home, info]
17. Concussion (album), Concussion (disambiguation), Concussion (film), Concussion: Wikipedia, the Free Encyclopedia [home, info]
18. Concussion: Online Plain Text English Dictionary [home, info]
19. concussion: Webster's Revised Unabridged, 1913 Edition [home, info]
20. concussion: Rhymezone [home, info]
21. Concussion: AllWords.com Multi-Lingual Dictionary [home, info]
22. concussion: Webster's 1828 Dictionary [home, info]
23. concussion: Free Dictionary [home, info]
24. concussion: Mnemonic Dictionary [home, info]
25. concussion: WordNet 1.7 Vocabulary Helper [home, info]
26. concussion: LookWAYup Translating Dictionary/Thesaurus [home, info]
27. concussion: Dictionary/thesaurus [home, info]

Business (2 matching dictionaries)

28. CONCUSSION: Bouvier's Law Dictionary 1856 Edition [home, info]
29. concussion: Legal dictionary [home, info]

Computing (1 matching dictionary)

30. concussion: Encyclopedia [home, info]

Medicine (15 matching dictionaries)

31. Concussion: MedTerms.com Medical Dictionary [home, info]
32. Concussion: Merck Manuals [home, info]
33. concussion: online medical dictionary [home, info]
34. CONCUSSION: Probert Encyclopaedia of Medicine [home, info]
35. Concussion: National MCH Center for Child Death Review [home, info]
36. Concussion: MEDLINE plus Illustrated Medical Encyclopedia [home, info]
37. concussion: Neurotrauma Glossary [home, info]
38. concussion: Parents' Common Sense Encyclopedia [home, info]
39. Concussion: A-Z Family health glossary [home, info]
40. concussion: Medical dictionary [home, info]
41. Concussion: Rudy's List of Archaic Medical Terms [home, info]
42. Concussion: University of Maryland Glossary of Medical Terms [home, info]
43. Concussion: Brain Injury [home, info]
44. Concussion: Drug Medical Dictionary [home, info]
45. concussion: Hyperdictionary [home, info]

Miscellaneous (2 matching dictionaries)

46. CONCUSSION: Navajo Code Talkers' Dictionary [home, info]
47. Concussion: Brilliant Dream Dictionary [home, info]

Slang (1 matching dictionary)

48. concussion: Urban Dictionary [home, info]

Sports (1 matching dictionary)

49. Concussion: Sports Definitions [home, info]

(Note: See concussive for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (concussion) ▸ noun:  any violent blow ▸ noun:  injury to the brain caused by a blow; usually resulting in loss of consciousness ▸ Also see concussive ▸ Word origin ▸ Words similar to concussion ▸ Usage examples for concussion ▸ Idioms related to concussion (New!) ▸ Popular adjectives describing concussion ▸ Words that often appear near concussion ▸ Rhymes of concussion ▸ Invented words related to concussion