1. (n.) The act or operation of melting or rendering fluid by heat; the act of melting together; as, the fusion of metals.

2. (n.) The state of being melted or dissolved by heat; a state of fluidity or flowing in consequence of heat; as, metals in fusion.

3. (n.) The union or blending together of things, as, melted together.

4. (n.) The union, or binding together, of adjacent parts or tissues.

Anschluss addition admixture affiliation agglomeration aggregation agreement alignment alliance alloy alloyage amalgam amalgamation assimilation association blend blending cabal cahoots cartel centralization coadunation coalescence coalition colleagueship collegialism collegiality colliquation combination combine combo comminglement commingling commixture composition compound comradeship confederacy confederation confraternity congeries conglomeration conjugation conjunction consolidation conspiracy copartnership copartnery decoagulation deliquescence deliquium dissolution dissolving eclecticism ecumenism embodiment encompassment enosis federalization federation fellowship fluidification fluidization fraternalism fraternity fraternization freemasonry fusibility fusing hookup identification identity immixture inclusion incorporation individuality indivisibility intactness integrality integration integrity interfusion interlarding interlardment interminglement intermingling intermixture inviolability irreducibility junction junta leaching league liquation liquefaction liquescence liquescency lixiviation marriage meld melding melting merger mingling mixing mixture oneness organic unity package package deal particularity partnership percolation pluralism purity running selfsameness simplicity singleness singularity sodality solidarity solidification solidity solubilization solution sorority syncretism syndication syneresis synthesis thaw thawing thermonuclear fusion thermonuclear reaction thermoplasticity tie-in tie-up unclotting undividedness unification uniformity union uniqueness unity univocity wedding wholeness