Fū'sion, n.

(fū'zhun), n. [Lat. fusio, from fundere, fusum, to pour, melt; Fr. & Sp. fusion, Pr. fuzio, fusión, It. fusione.]

1. The act or operation of melting or rendering fluid by heat alone, without the aid of a solvent; as, the fusion of ice or 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 into oneness, as if melted together.

So far did the emperor advance in this work of fusion, as to claim a place for himself among the Gaulish deities. Merivale.