1
a
: having such speed and kinetic energy as to exhibit relativistic departure from classical laws of motion
used especially of elementary particles whose velocity has been imparted by an accelerator
b
: of or relating to high-energy particles
2
: yielding a relatively large amount of energy when undergoing hydrolysis

Examples of high-energy in a Sentence

Recent Examples on the Web
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The best way to show your support for the high-energy, high-talent performers? Stacia Datskovska, Footwear News, 29 July 2026 That introduced me to high-energy punk music, which got me into punk culture. Jae-Ha Kim, Rolling Stone, 29 July 2026 This breed is a high-energy dog that's rascally, amusing and certainly vocal. Maddie Rhodes, USA Today, 28 July 2026 The accelerator relies on line-replaceable units (LRUs) to generate short, high-energy pulses that power the electron beam used to create X-rays. Bojan Stojkovski, Interesting Engineering, 26 July 2026 See All Example Sentences for high-energy

Word History

First Known Use

1934, in the meaning defined at sense 1a

Time Traveler
The first known use of high-energy was in 1934

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Cite this Entry

“High-energy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/high-energy. Accessed 1 Aug. 2026.

Medical Definition

high-energy

adjective
: yielding a relatively large amount of energy when undergoing hydrolysis
high-energy phosphate bonds in ATP
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