quantum mechanics

noun

plural in form but singular or plural in construction
: a theory of matter that is based on the concept of the possession of wave properties by elementary particles, that affords a mathematical interpretation of the structure and interactions of matter on the basis of these properties, and that incorporates within it quantum theory and the uncertainty principle

called also wave mechanics

quantum mechanical adjective
quantum mechanically adverb

Examples of quantum mechanics in a Sentence

Recent Examples on the Web
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.
In fact, the 2025 International Year of Quantum Science and Technology recognizes 100 years since the initial development of quantum mechanics, and much has been accomplished over the last century. Paul Terry, Forbes.com, 17 July 2025 One involved figuring out how to better incorporate instruction in quantum mechanics into high school and college education, rather than limiting this increasingly important topic to a handful of physics specialists. ArsTechnica, 9 July 2025 Google says that researchers gave a computer random instructions to make a problem as complex under quantum mechanics as possible. Kif Leswing, CNBC, 27 June 2025 But interestingly, quantum mechanics is often assumed to be invariant under time reversal. Manon Bischoff, Scientific American, 4 June 2025 See All Example Sentences for quantum mechanics

Word History

First Known Use

1922, in the meaning defined above

Time Traveler
The first known use of quantum mechanics was in 1922

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Cite this Entry

“Quantum mechanics.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quantum%20mechanics. Accessed 22 Jul. 2025.

Medical Definition

quantum mechanics

noun, plural in form but singular or plural in construction
: a theory of matter that is based on the concept of the possession of wave properties by elementary particles, that affords a mathematical interpretation of the structure and interactions of matter on the basis of these properties, and that incorporates within it quantum theory and the uncertainty principle

called also wave mechanics

quantum mechanical adjective
quantum mechanically adverb

More from Merriam-Webster on quantum mechanics

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