We found 11 dictionaries that define the word running lights:

General (6 matching dictionaries)

1. running lights: Merriam-Webster
2. running lights: Oxford Learner's Dictionaries
3. running lights: Collins English Dictionary
4. running lights: Vocabulary.com
5. running lights: Wiktionary
6. Running lights (theater), Running lights: Wikipedia, the Free Encyclopedia

Art (1 matching dictionary)

7. Technical Glossary of Theatre Terms (No longer online)

Business (1 matching dictionary)

8. Travel Industry Dictionary (No longer online)

Tech (3 matching dictionaries)

9. AUTOMOTIVE TERMS (No longer online)
10. RUNNING LIGHTS: Glossary of Nautical Terms
11. SeaTalk Dictionary of English Nautical Language (No longer online)

(Note: See running_light as well.)

Definitions from Wiktionary (running lights) ▸ noun:  headlights Similar: sidelight, autobraking, brake light, power assist, acetylene, autoflash, autolocking, attention getter, overhead fan, automobile racing, more... Opposite: parking lights, stationary lights, standing lights ▸ Words similar to running lights ▸ Usage examples for running lights ▸ Idioms related to running lights ▸ Wikipedia articles (New!) ▸ Words that often appear near running lights ▸ Rhymes of running lights ▸ Invented words related to running lights