captcha

CAPTCHA

C c

Transcription

- US Pronunciation
- US IPA
- [kap-chuh]
- /ˈkæp tʃə/

- US Pronunciation
- US IPA
- [kap-chuh]
- /ˈkæp tʃə/

Definitions of captcha word

variable noun captcha Captcha is a system for checking that a human and not a machine is using a computer. Captcha is an abbreviation for 'completely automated public Turing test to tell computers and humans apart'. 3
noun captcha a test designed to determine whether a computer user is a person or a machine, eg by asking the user to decipher a distorted image 3
noun captcha 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. 1
noun captcha a computer program that generates such tests. 1
noun captcha A program or system intended to distinguish human from machine input, typically as a way of thwarting spam and automated extraction of data from websites. 1
noun Definition of captcha in Technology (security) 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. 1

See all 7 definitions of captcha

Information block about the term

Origin of captcha

First appearance:

before 2000

One of the 1% newest English words

2000-05; C(ompletely) A(utomated) P(ublic) T(uring) (Test to Tell) C(omputers and) H(umans) A(part)

Historical Comparancy

Parts of speech for Captcha

noun

adjective

verb

adverb

pronoun

preposition

conjunction

determiner

exclamation

Full grammatical hierarchy of Captcha

captcha popularity

A common word. It’s meaning is known to most children of preschool age. About 87% of English native speakers know the meaning and use the word.

Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".

captcha usage trend in Literature

This diagram is provided by Google Ngram Viewer