What does CAPTCHA mean?
Completely Automated Public Turing test to tell Computers and Humans Apart
Other definitions of CAPTCHA:
It is a type of challenge response test used in computing to determine whether or not the user is human.
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How to use the term CAPTCHA:
text captcha , image captcha
More slang terms:
Took Nothing, Left Nothing, Signed Logbook
Locally Unwanted Land Use
nothing much here what about you