electromagnetic wave

noun

: one of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and that include radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays

Examples of electromagnetic wave in a Sentence

Recent Examples on the Web
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Unlike electromagnetic waves, acoustic waves can be used over extremely small footprints while also retaining energy or information for much longer. Ameya Paleja, Interesting Engineering, 3 June 2026 In fact, there is quite a bit of STEM R&D in your cell phone including digitization, electromagnetic waves, circuitry, transmission infrastructure, and other basic physics at the atomic level. Marshall Shepherd, Forbes.com, 31 May 2026 Hidden inside the orb, an antenna rotates while pulsing electromagnetic waves into the distance, waiting for a faint bounce to arrive back in the dish. Wyatt Williams, Harpers Magazine, 26 May 2026 If light was an electromagnetic wave, and all waves required a medium to travel through (which was our understanding at the time), then — as all the heavenly bodies traveled through the medium of space — surely that medium itself, the aether, was the medium that light traveled through. Big Think, 7 May 2026 See All Example Sentences for electromagnetic wave

Word History

First Known Use

1883, in the meaning defined above

Time Traveler
The first known use of electromagnetic wave was in 1883

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Cite this Entry

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

Kids Definition

electromagnetic wave

noun
: a wave (as a radio wave, wave of visible light, or X-ray) that consists of an associated electric and magnetic effect and travels at the speed of light

Medical Definition

electromagnetic wave

noun
: one of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and that include radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays

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