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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
CAPTCHA
A type of test used to determine whether a request
to a website comes from a human or a computer program,
typically by asking the user to perform some kind of {image
recognition} task such as reading distorted text. The term
was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas
J. Hopper (all of Carnegie Mellon University) and John
Langford (of IBM) as a contrived acronym for "Completely
Automated Public Turing test to tell Computers and Humans
Apart". CAPTCHA aims to prevent software tools from
performing actions which might degrade the service, such as
registering user accounts or automating the playing of a game.
(2009-01-02)