Usually means: Test to differentiate humans, bots.
Definitions Related words Mentions History Colors (New!) Easter eggs (New!)
We found 19 dictionaries that define the word CAPTCHA:

General (11 matching dictionaries)
  1. CAPTCHA, captcha: Merriam-Webster
  2. CAPTCHA, captcha: Oxford Learner's Dictionaries
  3. captcha: The Word Spy
  4. Captcha, captcha: Wordnik
  5. CAPTCHA, Captcha, captcha: Wiktionary
  6. CAPTCHA: Dictionary.com
  7. CAPTCHA, Captcha: Wikipedia, the Free Encyclopedia
  8. CAPTCHA: Stammtisch Beau Fleuve Acronyms
  9. captcha: Longman Dictionary of Contemporary English

Computing (5 matching dictionaries)
  1. CAPTCHA: Webster's New World Hacker Dictionary
  2. CAPTCHA: Free On-line Dictionary of Computing
  3. Captcha: Tech Terms Computer Dictionary
  4. Webopedia (No longer online)
  5. CAPTCHA, Captcha/: Encyclopedia

Miscellaneous (3 matching dictionaries)
  1. CAPTCHA: Acronym Finder
  2. AbbreviationZ (No longer online)
  3. captcha: Wordcraft Dictionary

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (computing, Internet) A computerized test requiring the human user to perform a task deemed to be difficult to automate, such as entering a displayed series of distorted characters or describing images, to demonstrate that they are a human and not a computer program.
noun:  Alternative letter-case form of CAPTCHA [(computing, Internet) A computerized test requiring the human user to perform a task deemed to be difficult to automate, such as entering a displayed series of distorted characters or describing images, to demonstrate that they are a human and not a computer program.]
noun:  Alternative letter-case form of CAPTCHA [(computing, Internet) A computerized test requiring the human user to perform a task deemed to be difficult to automate, such as entering a displayed series of distorted characters or describing images, to demonstrate that they are a human and not a computer program.]

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