Usually means: Unethical hacking for personal gain.
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We found 14 dictionaries that define the word black hat:

General (9 matching dictionaries)
  1. black hat: Merriam-Webster
  2. black hat: Oxford Learner's Dictionaries
  3. black hat: Collins English Dictionary
  4. black-hat: Wordnik
  5. black hat: Wiktionary
  6. black hat: Infoplease Dictionary
  7. black hat: Dictionary.com
  8. Black Hat, Black-hat, Black hat (computer security), Black hat (disambiguation), Black hat: Wikipedia, the Free Encyclopedia
  9. black hat: TheFreeDictionary.com

Computing (2 matching dictionaries)
  1. black hat: Netlingo
  2. Black hat: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. Black hat: Idioms

Slang (1 matching dictionary)
  1. black hat: Urban Dictionary

Sports (1 matching dictionary)
  1. Hickok Sports Glossaries (No longer online)

Definitions from Wiktionary (black hat)

noun:  A villain in a story, especially in a Western (a film or other work of the Western genre).
noun:  (computing, computer security, slang) A malicious hacker, one who violates computer security out of malice or for personal gain.
noun:  A Haredi Jew; a member of an ultra-Orthodox Jewish community.

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