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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) speed of_light: Vocabulary.com [home, info] speed of_light: Merriam-Webster's Online Dictionary, 11th Edition [home, info] speed of_light: Wiktionary [home, info] speed of_light: Dictionary.com [home, info] speed of_light: UltraLingua English Dictionary [home, info] Speed Of Light, Speed of_Light (album), Speed-of-light, Speed of_light (CA), Speed of_light (c), Speed of_light (cellular automaton), Speed of_light (disambiguation): Wikipedia, the Free Encyclopedia [home, info] speed of_light: Rhymezone [home, info] speed of_light: Free Dictionary [home, info] speed of_light: Mnemonic Dictionary [home, info] speed of_light: WordNet 1.7 Vocabulary Helper [home, info] speed of_light: LookWAYup Translating Dictionary/Thesaurus [home, info] speed of_light: Dictionary/thesaurus [home, info] Business (2 matching dictionaries) speed of_light: Legal dictionary [home, info] speed of_light: Financial dictionary [home, info] Computing (2 matching dictionaries) speed of_light: I T Glossary [home, info] Speed-of-light, Speed of_light (c), speed of_light: Encyclopedia [home, info] Medicine (1 matching dictionary) speed of_light: Medical dictionary [home, info] Science (5 matching dictionaries) Speed of Light: Eric Weisstein's World of Physics [home, info] speed of_light (in vacuum): Imagine the Universe! Dictionary [home, info] Speed of Light: Extragalactic Astronomy [home, info] speed of_light: Nine Planets Glossary [home, info] SPEED OF LIGHT: Zoom Astronomy Glossary [home, info] Slang (1 matching dictionary) speed of_light: Urban Dictionary [home, info] Tech (2 matching dictionaries) speed of_light (in vacuum): High-Energy Astrophysics [home, info] 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