Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “string theory”

string theory

noun [U]     specialized
a theory that says that the most basic pieces of matter are extremely small lines or circles rather than points Particular theories and concepts in physics
(Definition of string theory noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of string theory

Definitions of “string theory” in other dictionaries

Translations of “string theory”

Word of the Day


the art and knowledge involved in preparing and eating good food

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More