Usually means: Ethical hacker protecting against cyberattacks.
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We found 15 dictionaries that define the word white hat:

General (11 matching dictionaries)
  1. white hat: Merriam-Webster
  2. white hat: Oxford Learner's Dictionaries
  3. white-hat, white-hat, white hat: Collins English Dictionary
  4. white-hat: Wordnik
  5. white hat: Wiktionary
  6. white hat: Infoplease Dictionary
  7. white-hat, white hat: Dictionary.com
  8. White Hat, White-hat, White hat (computer security), White hat (computing), White hat (film): Wikipedia, the Free Encyclopedia
  9. White Hat: Dictionary of Phrase and Fable (1898)
  10. white hat: TheFreeDictionary.com
  11. White hat: Wikipedia, the Free Encyclopedia

Computing (3 matching dictionaries)
  1. white hat: Netlingo
  2. white-hat: Hacking Lexicon
  3. White hat: Encyclopedia

Slang (1 matching dictionary)
  1. White-hat: Urban Dictionary

Definitions from Wiktionary (white hat)

noun:  A good person; a hero.
noun:  (computing, computer security, slang) A well-meaning hacker who hacks for a good cause or to aid a company, organization, or government without causing harm (for example, to identify security flaws).
noun:  (slang) A sailor.

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