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English definition of “string theory”

string theory

noun [C]  /ˈstrɪŋ ˌθɪər·i, ˌθi·ə·ri/ us  
physics a theory explaining the character of matter and the forces of the universe, based on the idea that they behave more like closed circles of string than like points
(Definition of string theory from the Cambridge Academic Content Dictionary © Cambridge University Press)
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