The Collaborative International Dictionary of English v.0.48:

Meld \Meld\, v. t. & i. [imp. & p. p. Melded; p. pr. & vb. n.
   Melding.] [G. melden to announce.] (Card Playing)
   In the game of pinochle, to declare or announce for a score;
   as, to meld a sequence. [WordNet sense 1]
   [Webster 1913 Suppl.]

   2. to mix together so that the components are
      indistinguishable. [WordNet sense 2]

   Syn: blend, mix, conflate, commingle, immix, fuse, coalesce,
        combine, merge.
        [WordNet 1.5]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "melding":
   Anschluss, addition, affiliation, agglomeration, aggregation,
   agreement, alliance, amalgamation, assimilation, association,
   blend, blending, cabal, cartel, centralization, coadunation,
   coalescence, coalition, combination, combine, combo, composition,
   confederacy, confederation, congeries, conglomeration, conjugation,
   conjunction, consolidation, conspiracy, ecumenism, embodiment,
   encompassment, enosis, federalization, federation, fusion, hookup,
   inclusion, incorporation, integration, junction, junta, league,
   marriage, meld, mergence, merger, merging, package, package deal,
   solidification, syncretism, syndication, syneresis, synthesis,
   tie-up, unification, union, wedding