Definitions

quantum theory

[kwon-tuhm thee-uh-ree, theer-ee] / ˈkwɒn təm ˌθi ə ri, ˌθɪər i /

NOUN

atomic theory

Synonyms

WEAK

Bohr theory Dirac theory Doctrine of definite proportions Lewis-Langmuir theory Rutherford theory Schrödinger theory Thomson's hypothesis octet theory

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

quantum theory

While later discoveries refined that picture, Bohr's model helped pave the way for modern quantum theory.

From Science Daily ● Jul. 5, 2026

"Time plays very different roles in quantum theory and in relativity," says Pikovski.

From Science Daily ● May 18, 2026

However, quantum theory also offers another equally important framework developed by Werner Heisenberg.

From Science Daily ● Apr. 14, 2026

Despite their individual successes, quantum theory and general relativity do not fit together smoothly.

From Science Daily ● Jan. 8, 2026

This is the zero-point energy, an infinity in the formulas of quantum theory.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife