RED LIGHT | Meaning, Definition In Cambridge English Dictionary

Meaning of red light in English red lightnoun [ C ] uk /ˌred ˈlaɪt/ us /ˌred ˈlaɪt/ Add to word list Add to word list a red traffic signal that tells drivers to stop: The police fined her for driving through/jumping a red light.   Cláudio Policarpo/EyeEm/GettyImages Roads: lights, signs & markings on roads

• anti-billboard
• Belisha beacon
• billboard
• bollard
• bus lane
• milepost
• milestone
• no standing phrase
• no waiting phrase
• P, p
• pylon
• reflector
• signposting
• spike belt
• spike strip
• stinger
• stop light
• wait
• yellow line
• zebra crossing

See more results » (Definition of red light from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

red light | American Dictionary

red lightnoun [ C ] us /ˈred ˈlɑɪt/ Add to word list Add to word list a red traffic light, where vehicles have to stop (Definition of red light from the Cambridge Academic Content Dictionary © Cambridge University Press)

Examples of red light

red light The germination data that will be simulated by the model are induced by a saturating pulse of red light. From the Cambridge English Corpus Both had more uniformly high relative sensitivity to red light at all eccentricities. From the Cambridge English Corpus Rather, the problem is that red light, or red backgrounds, has substantial effects on the parvocellular red-green color-opponent cells. From the Cambridge English Corpus In experiments carried out in the dark, all manipulations including dissection, incubation, and tissue rinses were carried out under dim red light. From the Cambridge English Corpus All surgery and experimental procedures were conducted in dim red light. From the Cambridge English Corpus But is the amount of red light needed to cancel the greenness of a stimulus really an accurate measure of its degree of greenness? From the Cambridge English Corpus I can see how this might work for a small localised patch of red light with clear contours. From the Cambridge English Corpus In the dark-adapted state all surgery and the electrode placements were done under dim red light. From the Cambridge English Corpus Participants were to press the button signaled by a red light (the target button for that trial) as soon as possible. From the Cambridge English Corpus Following dark adaptation, an eye was removed, hemisected, and mounted in a recording chamber under dim red light. From the Cambridge English Corpus We noticed the red light over the door go on. From the Cambridge English Corpus A small red light and buzzer mounted above the centre of the screen were used to centre infants' attention between trials. From the Cambridge English Corpus All manipulations are per formed in dim red light. From the Cambridge English Corpus The reduction of masking in the presence of red light was then assumed to reflect reduced input from the magnocellular system. From the Cambridge English Corpus The animals were dark adapted for 30 min before surgery, and all surgery was done in dim red light. From the Cambridge English Corpus See all examples of red light These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. What is the pronunciation of red light?

Translations of red light

in Chinese (Traditional) （交通）紅燈… See more in Chinese (Simplified) （交通）红灯… See more in Spanish semáforo en rojo… See more in Portuguese sinal vermelho… See more Need a translator?

Get a quick, free translation!

Translator tool

Browse

Red Indian red ink red kangaroo red kite red light red line red maple red marrow red meat {{#randomImageQuizHook.filename}} {{#randomImageQuizHook.isQuiz}} Test your vocabulary with our fun image quizzes Try a quiz now {{/randomImageQuizHook.isQuiz}} {{^randomImageQuizHook.isQuiz}} {{/randomImageQuizHook.isQuiz}} {{/randomImageQuizHook.filename}}

More meanings of red light

• red-light district
• run a red light, at run a light

See all meanings

Word of the Day

at sixes and sevens

in a confused, badly organized, or difficult situation

About this

Blog

Throwing a punch or throwing your head back: using the verb ‘throw’

March 04, 2026 Read More

New Words

hushpitality March 02, 2026 More new words has been added to list To top AI Assistant Contents EnglishAmericanExamplesTranslations AI Assistant {{#displayLoginPopup}} Cambridge Dictionary +Plus

Learn more with +Plus

Sign up for free and get access to exclusive content: Free word lists and quizzes from Cambridge Tools to create your own word lists and quizzes Word lists shared by our community of dictionary fans Sign up now or Log in Cambridge Dictionary +Plus

Learn more with +Plus

Create word lists and quizzes for free Sign up now or Log in {{/displayLoginPopup}} {{#displayClassicSurvey}} {{/displayClassicSurvey}}

• Cambridge Dictionary +Plus
• My profile
• +Plus help
• Log out

AI Assistant Dictionary Definitions Clear explanations of natural written and spoken English English Learner’s Dictionary Essential British English Essential American English Translations Click on the arrows to change the translation direction. Bilingual Dictionaries English–Chinese (Simplified) Chinese (Simplified)–English English–Chinese (Traditional) Chinese (Traditional)–English English–Danish Danish–English English–Dutch Dutch–English English–French French–English English–German German–English English–Indonesian Indonesian–English English–Italian Italian–English English–Japanese Japanese–English English–Norwegian Norwegian–English English–Polish Polish–English English–Portuguese Portuguese–English English–Spanish Spanish–English English–Swedish Swedish–English Semi-bilingual Dictionaries English–Arabic English–Bengali English–Catalan English–Czech English–Gujarati English–Hindi English–Korean English–Malay English–Marathi English–Russian English–Tamil English–Telugu English–Thai English–Turkish English–Ukrainian English–Urdu English–Vietnamese Translate Grammar Thesaurus Pronunciation Cambridge Dictionary +Plus Games {{userName}}

• Cambridge Dictionary +Plus
• My profile
• +Plus help
• Log out

Log in / Sign up English (UK) Change English (UK) English (US) Español Português 中文 (简体) 正體中文 (繁體) Dansk Deutsch Français Italiano Nederlands Norsk Polski Русский Türkçe Tiếng Việt Svenska Українська 日本語 한국어 ગુજરાતી தமிழ் తెలుగు বাঙ্গালি मराठी हिंदी Follow us Choose a dictionary

• Recent and Recommended {{#preferredDictionaries}} {{name}} {{/preferredDictionaries}}
• Definitions Clear explanations of natural written and spoken English English Learner’s Dictionary Essential British English Essential American English
• Grammar and thesaurus Usage explanations of natural written and spoken English Grammar Thesaurus
• Pronunciation British and American pronunciations with audio English Pronunciation
• Translation Click on the arrows to change the translation direction. Bilingual Dictionaries
  • English–Chinese (Simplified) Chinese (Simplified)–English
  • English–Chinese (Traditional) Chinese (Traditional)–English
  • English–Danish Danish–English
  • English–Dutch Dutch–English
  • English–French French–English
  • English–German German–English
  • English–Indonesian Indonesian–English
  • English–Italian Italian–English
  • English–Japanese Japanese–English
  • English–Norwegian Norwegian–English
  • English–Polish Polish–English
  • English–Portuguese Portuguese–English
  • English–Spanish Spanish–English
  • English–Swedish Swedish–English
  Semi-bilingual Dictionaries English–Arabic English–Bengali English–Catalan English–Czech English–Gujarati English–Hindi English–Korean English–Malay English–Marathi English–Russian English–Tamil English–Telugu English–Thai English–Turkish English–Ukrainian English–Urdu English–Vietnamese
• Dictionary +Plus Word Lists

Choose your language English (UK) English (US) Español Português 中文 (简体) 正體中文 (繁體) Dansk Deutsch Français Italiano Nederlands Norsk Polski Русский Türkçe Tiếng Việt Svenska Українська 日本語 한국어 ગુજરાતી தமிழ் తెలుగు বাঙ্গালি मराठी हिंदी Contents

• English   Noun
• American   Noun
• Examples

• Translations
• Grammar
• All translations

My word lists

To add red light to a word list please sign up or log in.

Sign up or Log in My word lists

Add red light to one of your lists below, or create a new one.

{{#verifyErrors}}

{{message}}

{{/verifyErrors}} {{^verifyErrors}} {{#message}}

{{message}}

{{/message}} {{^message}}

Something went wrong.

{{/message}} {{/verifyErrors}} {{name}} More Go to your word lists {{#verifyErrors}}

{{message}}

{{/verifyErrors}} {{^verifyErrors}} {{#message}}

{{message}}

{{/message}} {{^message}}

Something went wrong.

{{/message}} {{/verifyErrors}} Tell us about this example sentence: The word in the example sentence does not match the entry word. The sentence contains offensive content. Cancel Submit Thanks! Your feedback will be reviewed. {{#verifyErrors}}

{{message}}

{{/verifyErrors}} {{^verifyErrors}} {{#message}}

{{message}}

{{/message}} {{^message}}

There was a problem sending your report.

{{/message}} {{/verifyErrors}} The word in the example sentence does not match the entry word. The sentence contains offensive content. Cancel Submit Thanks! Your feedback will be reviewed. {{#verifyErrors}}

{{message}}

{{/verifyErrors}} {{^verifyErrors}} {{#message}}

{{message}}

{{/message}} {{^message}}

There was a problem sending your report.

{{/message}} {{/verifyErrors}}