Definition of captcha noun from the Oxford Advanced Learner's Dictionary



(also CAPTCHA) noun
BrE BrE//ˈkæptʃə//
; NAmE NAmE//ˈkæptʃə//
[countable, uncountable]
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a computer program that is designed to distinguish between human users and machines, often showing letters or numbers with their shape changed slightly The captcha can only be solved by humans. An acronym from Completely Automated Public Turing test to tell Computers and Humans Apart.