captcha: meaning, definition, pronunciation and examples
B2Technical/Neutral
Quick answer
What does “captcha” mean?
A computer-generated test that a website user must pass to prove they are human, designed to prevent bots from accessing or submitting forms.
Audio
Pronunciation
Definition
Meaning and Definition
A computer-generated test that a website user must pass to prove they are human, designed to prevent bots from accessing or submitting forms.
A challenge-response test used in computing to differentiate between human users and automated bots. The term is an acronym for 'Completely Automated Public Turing test to tell Computers and Humans Apart'.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling is consistent. The term is equally understood in both varieties.
Connotations
Neutral technical term in both varieties, often associated with minor user friction online.
Frequency
Equally common in both UK and US English, given its universal application on the internet.
Grammar
How to Use “captcha” in a Sentence
solve + captcha (direct object)be presented with + captchafail + captcha (direct object)bypass + captcha (direct object)Vocabulary
Collocations
Examples
Examples of “captcha” in a Sentence
verb
British English
- The system will require you to captcha before proceeding. (Note: This is a rare, emerging usage and not standard.)
American English
- You'll need to captcha to prove you're not a robot. (Note: This is a rare, emerging usage and not standard.)
adjective
British English
- The captcha system failed, letting spam through.
American English
- We added a captcha page to the registration form.
Usage
Meaning in Context
Business
Discussing website security, user authentication flows, and bot prevention measures.
Academic
In computer science, cybersecurity, and human-computer interaction research papers.
Everyday
Complaining about or describing the step required to log in to a website or submit a comment.
Technical
Precisely describing a type of challenge-response authentication mechanism.
Vocabulary
Synonyms of “captcha”
Strong
Neutral
Weak
Vocabulary
Antonyms of “captcha”
Watch out
Common Mistakes When Using “captcha”
- Incorrect spelling: 'capcha', 'captch'. Using it as a verb ('to captcha' is non-standard, though 'to solve a captcha' is correct).
FAQ
Frequently Asked Questions
Completely Automated Public Turing test to tell Computers and Humans Apart.
reCAPTCHA is a specific, widely used type of CAPTCHA developed by Google, often using image recognition tasks.
They are intentionally distorted to prevent optical character recognition (OCR) software used by bots from easily deciphering them.
Yes, if you incorrectly solve the puzzle (e.g., misidentify images or mistype characters), you will fail and typically be given a new one.
A computer-generated test that a website user must pass to prove they are human, designed to prevent bots from accessing or submitting forms.
Captcha is usually technical/neutral in register.
Captcha: in British English it is pronounced /ˈkap.tʃə/, and in American English it is pronounced /ˈkæp.tʃə/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “It's like trying to read a captcha. (Meaning: something is distorted and very hard to decipher.)”
Learning
Memory Aids
Mnemonic
CAPTCHA catches automated programs. Think: 'CAPTure CHAracters' or 'CAPTure CHAos' you have to solve.
Conceptual Metaphor
A GATEKEEPER or GUARD (it stands at the entrance to a website's functionality, allowing only humans to pass).
Practice
Quiz
What is the primary purpose of a captcha?