electromagnetic radiation

noun

: energy in the form of electromagnetic waves
also : a series of electromagnetic waves

Examples of electromagnetic radiation in a Sentence

Recent Examples on the Web
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Then the fact that the more distant radio wave pulses aligned with gamma-ray blasts from these pulsars detected by NASA's Fermi Space Telescope indicated to the team that both types of electromagnetic radiation were being emitted from the same non-polar and distant regions around these pulsars. Robert Lea, Space.com, 3 Apr. 2026 That gravitational radiation is similar to conventional, electromagnetic radiation in many ways, but different in a few profound ones. Big Think, 3 Apr. 2026 Astrophage is incredibly efficient at absorbing electromagnetic radiation, which includes visible light. Encyclopedia Britannica, 23 Mar. 2026 Researchers are excited about gravitational waves because these spacetime ripples constitute an entirely new way to study the universe, independent of the electromagnetic radiation (light) upon which most other astronomical observations rely. K. R. Callaway, Scientific American, 17 Mar. 2026 See All Example Sentences for electromagnetic radiation

Word History

First Known Use

1891, in the meaning defined above

Time Traveler
The first known use of electromagnetic radiation was in 1891

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Cite this Entry

“Electromagnetic radiation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/electromagnetic%20radiation. Accessed 6 Apr. 2026.

Kids Definition

electromagnetic radiation

noun
: energy in the form of electromagnetic waves
also : a series of electromagnetic waves

Medical Definition

electromagnetic radiation

noun
: a series of electromagnetic waves

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