fusion

fusion is a Noun

Definition:

[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. C. Kingsley. Watery fusion (Chem.) the melting of certain crystals by heat in their own water of crystallization.

[4] The union, or binding together, of adjacent parts or tissues.