
A Grand Unified Theory (GUT) is a model in particle physics in which at high energy, the three gauge interactions of the Standard Model which define the electromagnetic, weak, and strong interactions or forces, are merged into one single force. This unified interaction is characterized by one larger gauge symmetry and thus several force carriers, ...
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http://en.wikipedia.org/wiki/Grand_Unified_Theory

in particle physics, theory that attempts to unify the strong force with the electroweak force. See unified field theory.
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http://www.britannica.com/eb/a-z/g/58
(GUT) A class of theories that attempts to merge all three nongravitational forces – the electromagnetic force, weak force, and strong force – into a single theoretical framework. The grand unification energy is the energy above which, it is believed, the electromagn...
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http://www.daviddarling.info/encyclopedia/G/GUT.html

In physics, sought-for theory that would combine the theory of the strong nuclear force (called quantum chromodynamics) with the theory of the weak nuclear and electromagnetic forces (see forces, fundamental). The search for the grand unified theory is part of a larger programme seeking a unified field theory, or `theory of everything`...
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https://www.encyclo.co.uk/local/21221
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