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

General relativity is incompatible with quantum mechanics, despite our best efforts to reconcile the two, and does not explain dark energy. — Jacek Krywko, ArsTechnica, 10 July 2026

Physicists Nir Navon and Jianyi Chen at Yale University focused on what scientists often get wrong in quantum mechanics and have now provided a ‘user manual’ to guide them through the process. — Ameya Paleja, Interesting Engineering, 10 July 2026

In quantum mechanics, alternate states of the world can be said to exist together in superposition—Schrödinger’s famous cat is both alive and dead at the same time. — Idrees Kahloon, The Atlantic, 9 July 2026

Richard Feynman, the Nobel Prize-winning physicist, was legendary for his ability to explain quantum mechanics to anyone. — Andy Molinsky, Forbes.com, 7 July 2026

Word History

First Known Use

1922, in the meaning defined above

Rhymes for quantum mechanics

• biomechanics
• hispanics
• organics
• volcanics
• panics

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