quantum theory

noun

1

: a theory in physics based on the concept of the subdivision of radiant energy into finite quanta and applied to numerous processes involving transference or transformation of energy in an atomic or molecular scale

2

: quantum mechanics

Examples of quantum theory in a Sentence

Recent Examples on the Web

The Real Singularity But Bousso’s theorem still doesn’t tell us exactly what form singularities will take at the core of the onion — that is, in the ultimate quantum theory of gravity. —Charlie Wood, Quanta Magazine, 27 May 2025

While quantum theory seems to allow it, physicists have had difficulty finding a mathematical description of a paraparticle that works. —Shalma Wegsman, Wired News, 25 May 2025

In quantum theory, reality is often viewed as not fixed or deterministic. —Yasmine McDougall Sterea, Forbes.com, 13 May 2025

Sean Hartnoll has been analyzing the chaotic behavior found inside black holes in the hopes of coming up with a quantum theory of gravity. —Lyndie Chiou, Wired News, 20 Apr. 2025

Word History

First Known Use

1912, in the meaning defined at sense 1

Rhymes for quantum theory

• cavaliere
• cavalieri
• presbytery
• beery
• bleary
• cheery
• cirri
• dearie
• deary
• dreary
• eerie
• kiri

Kids Definition

quantum theory

noun

: a theory in physics based on the idea that radiant energy (as light) is composed of small separate packets of energy

Medical Definition

quantum theory

noun

: a theory in physics based on the concept of the subdivision of radiant energy into finite quanta and applied to numerous processes involving transference or transformation of energy in an atomic or molecular scale