grand unified theory
noun/ˌɡrænd ˌjuːnɪfaɪd ˈθɪəri/
/ˌɡrænd ˌjuːnɪfaɪd ˈθiːəri/, /ˌɡrænd ˌjuːnɪfaɪd ˈθɪri/
(physics)- a single theory that tries to explain all the behaviour of subatomic particles
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grand unified theory