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noun grand unification theory, grand unified theory  n.  (Theoretical physics) Any of a class of physics theories that attempts to explain the electroweak forces, stong force, and gravitation within a single mathematical conceptual scheme. In the 1990's string theory and superstring theory were prominent examples. Abbreviated GUT, plural GUTs. 
 
 
 
  
 Collaborative International Dictionary of English 0.48 
 
  
 
 
  
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