Webster's English Dictionary

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fusion

fu.sion \'fyu:-zh*n\ n [L fusion-, fusio, fr. fusus, pp.] often attrib  1a: 
   the act or process of liquefying or rendering plastic by heat  1b: the 
   liquid or plastic state induced by heat  2: a union by melting : as  2a: a 
   merging of diverse elements into a unified whole  2b: a political 
   partnership : COALITION  2c: the union of atomic nuclei to form heavier 
   nuclei resulting in the rele ase of enormous quantities of energy when 
   certain light elements unite