Fu"sion (?), n. [L. fusio, fr. fundere, fusum to pour, melt: cf. F. fusion. See Fuse, v. t., aud 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.
C. Kingsley.
Watery fusion Chem. the melting of certain crystals by heat in their own water of crystallization.
4. Biol.
The union, or binding together, of adjacent parts or tissues.
© Webster 1913.