speed of light
noun phrase
: a fundamental physical constant that is the speed at which electromagnetic radiation propagates in a vacuum and that has a value fixed by international convention of 299,792,458 meters per second
—symbol c
Examples of speed of light in a Sentence
Recent Examples on the Web
Fast Performance The speed of light will still be a constraint, but performance and access to data will improve even over the extended distances of space.
—
Russ Kennedy, Forbes, 30 Dec. 2024
There is no longer a need to create phrases that are easy to type on a mobile T9 keyboard, instead, Gen Z slang seems to be shaped by meme cycles that evolve at the speed of light and a love of the group chat over online message boards.
—Benedict Cosgrove, Newsweek, 20 Dec. 2024
Regions of intense magnetic activity known as sunspots are proliferating on the solar surface and are capable of releasing intense bursts of radiation resulting in solar flares that can hurtle toward Earth at the speed of light, according to NOAA.
—Eric Lagatta, The Indianapolis Star, 28 Nov. 2024
These are particles moving at almost the speed of light and are thought to be produced by some of the most violent and magnetic objects in the universe: supernova remnants, active black holes and so forth.
—Keith Cooper, Space.com, 25 Dec. 2024
See all Example Sentences for speed of light 
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Russ Kennedy, Forbes, 30 Dec. 2024
There is no longer a need to create phrases that are easy to type on a mobile T9 keyboard, instead, Gen Z slang seems to be shaped by meme cycles that evolve at the speed of light and a love of the group chat over online message boards.
—Benedict Cosgrove, Newsweek, 20 Dec. 2024
Regions of intense magnetic activity known as sunspots are proliferating on the solar surface and are capable of releasing intense bursts of radiation resulting in solar flares that can hurtle toward Earth at the speed of light, according to NOAA.
—Eric Lagatta, The Indianapolis Star, 28 Nov. 2024
These are particles moving at almost the speed of light and are thought to be produced by some of the most violent and magnetic objects in the universe: supernova remnants, active black holes and so forth.
—Keith Cooper, Space.com, 25 Dec. 2024
See all Example Sentences for speed of light
Dictionary Entries Near speed of light
Cite this Entry
“Speed of light.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/speed%20of%20light. Accessed 3 Jan. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share