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

This is one of the terrible impacts of quantum mechanics on pop culture, this idea that an observer was required for quantum mechanics to make sense, that the observer collapsed the wave function the way that people talked about it. — Quanta Magazine, 17 Sep. 2026

Rovelli dedicates considerable space to a view of quantum mechanics called the relational interpretation. — Adam Frank, NPR, 14 Sep. 2026

And this, according to Penrose’s hypothesis, developed independently by the Hungarian physicist Lajos Diósi, is where quantum mechanics should break down. — Jacek Krywko, ArsTechnica, 11 Sep. 2026

Consider Einstein's iconic theory of gravity, general relativity, and the elusive realm of quantum mechanics. — Robert Lea, Space.com, 8 Sep. 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