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We found 25 dictionaries with English definitions that include the word speed of light:
Click on the first link on a line below to go directly to a page where "speed of light" is defined.

General (12 matching dictionaries)

1. speed of_light: Merriam-Webster.com [home, info]
2. speed of_light: Vocabulary.com [home, info]
3. speed of_light: Wiktionary [home, info]
4. speed of_light: Dictionary.com [home, info]
5. speed of_light: UltraLingua English Dictionary [home, info]
6. Speed of_Light (Iron Maiden song), Speed of_Light (album), Speed of_Light (song), Speed of Light, Speed-of-light, Speed of_light (cellular automaton), Speed of_light (disambiguation), Speed of light, The speed of light: Wikipedia, the Free Encyclopedia [home, info]
7. speed of_light: Rhymezone [home, info]
8. speed of_light: Free Dictionary [home, info]
9. speed of_light: Mnemonic Dictionary [home, info]
10. speed of_light: WordNet 1.7 Vocabulary Helper [home, info]
11. speed of_light: LookWAYup Translating Dictionary/Thesaurus [home, info]
12. speed of_light: Dictionary/thesaurus [home, info]

Business (2 matching dictionaries)

13. speed of_light: Legal dictionary [home, info]
14. speed of_light: Financial dictionary [home, info]

Computing (2 matching dictionaries)

15. speed of_light: I T Glossary [home, info]
16. Speed-of-light, Speed of_light (c), speed of_light: Encyclopedia [home, info]

Medicine (1 matching dictionary)

17. speed of_light: Medical dictionary [home, info]

Science (5 matching dictionaries)

18. Speed of Light: Eric Weisstein's World of Physics [home, info]
19. speed of_light (in vacuum): Imagine the Universe! Dictionary [home, info]
20. Speed of Light: Extragalactic Astronomy [home, info]
21. speed of_light: Nine Planets Glossary [home, info]
22. SPEED OF LIGHT: Zoom Astronomy Glossary [home, info]

Slang (1 matching dictionary)

23. speed of_light: Urban Dictionary [home, info]

Tech (2 matching dictionaries)

24. speed of_light (in vacuum): High-Energy Astrophysics [home, info]
25. speed of_light: Glossary of Meteorology [home, info]

Quick definitions from WordNet (speed of light) ▸ noun:  the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second ▸ Words similar to speed of light ▸ Usage examples for speed of light ▸ Words that often appear near speed of light ▸ Rhymes of speed of light ▸ Invented words related to speed of light