Fu"sion (?), n. [L. fusio, fr. fundere, fusum to pour, melt: cf. F. fusion. See Fuse, v. t., and cf. Foison.] 1. The act or operation of melting or rendering fluid by heat; the act of melting together; as, the fusion of metals.

2. The state of being melted or dissolved by heat; a state of fluidity or flowing in consequence of heat; as, metals in fusion.

3. The union or blending together of things, as, melted together.

The universal fusion of races, languages, and customs . . .
had produced a corresponding fusion of creeds.

4. (Biol.) The union, or binding together, of adjacent parts or tissues.

• The act of melting or liquefying something by heating it
  
• The merging of similar or different elements into a union
  
• (physics) A nuclear reaction in which nuclei combine to form more massive nuclei with the concomitant release of energy
  
• Music that blends disparate genres; especially types of jazz
  
• A style of cooking that combines ingredients and techniques from different countries or cultures