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We found 14 dictionaries with English definitions that include the word light speed:
Click on the first link on a line below to go directly to a page where "light speed" is defined.

General (11 matching dictionaries)

1. light speed: Merriam-Webster.com [home, info]
2. light speed: Vocabulary.com [home, info]
3. light-speed: Wordnik [home, info]
4. light speed: Wiktionary [home, info]
5. light speed: Dictionary.com [home, info]
6. Light Speed, Light-speed, Light speed: Wikipedia, the Free Encyclopedia [home, info]
7. light speed: Rhymezone [home, info]
8. light speed: Free Dictionary [home, info]
9. light speed: Mnemonic Dictionary [home, info]
10. light speed: LookWAYup Translating Dictionary/Thesaurus [home, info]
11. light speed: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

12. light speed: Encyclopedia [home, info]

Slang (1 matching dictionary)

13. Light Speed: Urban Dictionary [home, info]

Tech (1 matching dictionary)

14. Light speed: Basics of Space Flight Glossary [home, info]

(Note: See light_speeds for more definitions.)

Quick definitions from WordNet (light speed) ▸ 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 ▸ Also see light_speeds ▸ Words similar to light speed ▸ Usage examples for light speed ▸ Idioms related to light speed (New!) ▸ Words that often appear near light speed ▸ Rhymes of light speed ▸ Invented words related to light speed