We found 27 dictionaries that define the word red light:

General (20 matching dictionaries)

1. red-light, red light: Merriam-Webster
2. red light: Oxford Learner's Dictionaries
3. red light: American Heritage Dictionary of the English Language
4. red light: Collins English Dictionary
5. red light: Vocabulary.com
6. Red-Light, Red-light: Wordnik
7. red light: Cambridge Advanced Learner's Dictionary
8. red light: Wiktionary
9. red light: The Wordsmyth English Dictionary-Thesaurus
10. red light: Infoplease Dictionary
11. red-light, red light: Dictionary.com
12. red-light: Cambridge Essential American English Dictionary
13. Red Light (Bladee album), Red Light (David Nail song), Red Light (Linda Clifford song), Red Light (U2 song), Red Light (album), Red Light (film), Red Light, Red light (traffic light), Red light: Wikipedia, the Free Encyclopedia
14. red light: Rhymezone
15. red light: FreeDictionary.org
16. red light: Mnemonic Dictionary
17. red light: TheFreeDictionary.com
18. red-light, red light: Wordnik

Computing (1 matching dictionary)

19. red light: Encyclopedia

Science (1 matching dictionary)

20. Agricultural Thesaurus and Glossary (No longer online)

Slang (3 matching dictionaries)

21. red light, red light, red light, red light: Green’s Dictionary of Slang
22. Red Light: Urban Dictionary
23. Red-light: Twists, Slugs and Roscoes: Hardboiled Slang

Sports (2 matching dictionaries)

24. Hickok Sports Glossaries (No longer online)
25. Red light: Sports Definitions

(Note: See red_lighting as well.)

Definitions from Wiktionary (red light) ▸ noun:  A warning light, especially as a traffic signal indicating stop. ▸ noun:  A sign of a brothel. ▸ noun:  (idiomatic) A denial to proceed a ruling out of any possibility. Similar: warning light, red light camera, red-light camera, red flag, cherry, red zone, range light, route indicator, red flag law, red light district, more... Opposite: green light, go signal, proceed signal Types: stop light, tail light, brake light, traffic light, warning light, hazard light, police light, more... Phrases: red light district, red light districts, red light camera, run a red light, The Red Light District, more... Adjectives: red, yellow, green, amber, clear, light, express, switch, nonstop, signal, itinerary ▸ Words similar to red light ▸ Usage examples for red light ▸ Idioms related to red light ▸ Wikipedia articles (New!) ▸ Words that often appear near red light ▸ Rhymes of red light ▸ Invented words related to red light