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Definition of grand unified theory noun from the Oxford Advanced Learner's Dictionary

grand unified theory

noun

/ˌɡrænd ˌjuːnɪfaɪd ˈθɪəri/

/ˌɡrænd ˌjuːnɪfaɪd ˈθiːəri/,

/ˌɡrænd ˌjuːnɪfaɪd ˈθɪri/

(physics)

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a single theory that tries to explain all the behaviour of subatomic particles

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