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[kap-chuh] /ˈkæp tʃə/
noun, Digital Technology.
an online test designed so that humans but not computers are able to pass it, used as a security measure and usually involving a visual-perception task:
Site visitors must solve the “distorted text” CAPTCHA before posting comments.
a computer program that generates such tests.
Origin of CAPTCHA
2000-05; C(ompletely) A(utomated) P(ublic) T(uring) (Test to Tell) C(omputers and) H(umans) A(part) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for CAPTCHA
Contemporary Examples
  • Called "CAPTCHA," it's essentially a test that's easy for a human to complete, but difficult or impossible for a computer to do.

Contemporary definitions for CAPTCHA

a computer-generated squiggly-letter test that must be typed in by Internet/Web users to prove they are human


In order to send an email about a New York Times article, the site makes you type in a captcha.

Word Origin

by 2001; acronym for Completely Automatic Public Turing test to tell Computers and Humans Apart's 21st Century Lexicon
Copyright © 2003-2014, LLC
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