Usually means: Effect or influence on something.
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We found 47 dictionaries that define the word impact:

General (27 matching dictionaries)
  1. impact: Merriam-Webster
  2. impact: Oxford Learner's Dictionaries
  3. impact: American Heritage Dictionary of the English Language
  4. impact: Collins English Dictionary
  5. impact: Vocabulary.com
  6. Impact, impact: Wordnik
  7. impact: Cambridge Advanced Learner's Dictionary
  8. impact: Wiktionary
  9. impact: Webster's New World College Dictionary, 4th Ed.
  10. impact: The Wordsmyth English Dictionary-Thesaurus
  11. impact: Infoplease Dictionary
  12. Impact, impact: Dictionary.com
  13. impact (v.): Online Etymology Dictionary
  14. impact: Cambridge Essential American English Dictionary
  15. IMPACT (computer graphics), IMPACT (organisation), IMPACT, Impact (EC Comics), Impact (EP), Impact (TV miniseries), Impact (TV programme), Impact (UNESCO magazine), Impact (band), Impact (custom car), Impact (film), Impact (mechanics), Impact (miniseries), Impact (novel), Impact (student magazine), Impact (typeface), Impact (video game player), Impact: Wikipedia, the Free Encyclopedia
  16. Impact: Online Plain Text English Dictionary
  17. impact: Webster's Revised Unabridged, 1913 Edition
  18. impact: Rhymezone
  19. impact, impact (de), impact (f): AllWords.com Multi-Lingual Dictionary
  20. impact: Webster's 1828 Dictionary
  21. IMPACT, impact: Stammtisch Beau Fleuve Acronyms
  22. impact: FreeDictionary.org
  23. impact: Mnemonic Dictionary
  24. impact: TheFreeDictionary.com
  25. impact: Longman Dictionary of Contemporary English

Business (4 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Construction Term Glossary (No longer online)
  3. impact: Legal dictionary
  4. BusinessDictionary.com (No longer online)

Computing (3 matching dictionaries)
  1. Impact: Cybernetics and Systems
  2. Internet Terms (No longer online)
  3. impact: Encyclopedia

Medicine (4 matching dictionaries)
  1. Impact: MedTerms.com Medical Dictionary
  2. online medical dictionary (No longer online)
  3. IMPACT: Medical dictionary
  4. Impact: Drug Medical Dictionary

Miscellaneous (4 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. IMPACT: Acronym Finder
  3. AbbreviationZ (No longer online)
  4. impact: Idioms

Science (1 matching dictionary)
  1. impact: Evolution Glossary

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

Sports (1 matching dictionary)
  1. impact: Golfer's Dictionary

Tech (2 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. National Glass Association Glossary (No longer online)

(Note: See impacted as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The striking of one body against another; collision.
noun:  The force or energy of a collision of two objects.
noun:  (chiefly medicine) A forced impinging.
noun:  (figurative, proscribed) A significant or strong influence or effect.
verb:  (transitive) To collide or strike, the act of impinging.
verb:  (transitive) To compress; to compact; to press into something or pack together.
verb:  (transitive, figurative, proscribed) To significantly or strongly influence or affect; to have an impact on.
verb:  (transitive, rare) To stamp or impress onto something.

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