Definition of "captcha" [captcha]

• Alternative capitalization of CAPTCHA (noun)

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• ""A 'captcha' is a program that can tell whether its user is a human or a computer [such as those with distorted images of letters].""
• "In this case, captcha is required in order to connect to the internet with GoGoInFlight."
• "A good team required for a long term captcha project."