Webster's Revised Unabridged Dictionary · 1913

Fusion

Fusion , noun

[Latin fusio, from fundere, fusum to pour, melt: compare French fusion. See Fuse, transitive verb, 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
Collocations (1)
Watery fusion (Chemistry) , the melting of certain crystals by heat in their own water of crystallization.
4.
(Biology) The union, or binding together, of adjacent parts or tissues.