(n.) The act of unifying, or the state of being unified.

Anschluss addition affiliation agglomeration agglutination aggregation agreement alignment alliance amalgamation articulation assimilation association blend blending bond bracketing cabal cahoots cartel centralization clustering coadunation coalescence coalition colleagueship collegialism collegiality combination combine combo communication composition comradeship concatenation concourse concurrence confederacy confederation confluence confraternity congeries conglomeration conjugation conjunction connection consolidation conspiracy convergence copartnership copartnery copulation coupling ecumenism embodiment encompassment enosis federalization federation fellowship fraternalism fraternity fraternization freemasonry fusion gathering hookup identification identity inclusion incorporation individuality indivisibility intactness integrality integration integrity intercommunication intercourse interlinking interlocking inviolability irreducibility joinder joining jointure junction junta knotting league liaison linkage linking marriage meeting meld melding mergence merger merging oneness organic unity package package deal pairing particularity partnership purity selfsameness simplicity singleness singularity sodality solidarity solidification solidity sorority splice symbiosis syncretism syndication syneresis synthesis tie tie-in tie-up undividedness uniformity union uniqueness unity univocity wedding wholeness yoking