Definition of fusion

• v. t. - The act or operation of melting or rendering fluid by heat; the act of melting together; as, the fusion of metals.
• v. t. - The state of being melted or dissolved by heat; a state of fluidity or flowing in consequence of heat; as, metals in fusion.
• v. t. - The union or blending together of things, as, melted together.
• v. t. - The union, or binding together, of adjacent parts or tissues.