[1] : The Collaborative International Dictionary of English v.0.48

amalgamation \amal`gama"tion\, n. cf. f. amalgamation.
   1. the act or operation of compounding mercury with another
      metal; -- applied particularly to the process of
      separating gold and silver from their ores by mixing them
      with mercury. --ure.
      1913 webster

   2. the mixing or blending of different elements, races,
      societies, etc.; also, the result of such combination or
      blending; a homogeneous union. --macaulay.
      1913 webster

[2] : WordNet (r) 2.0

amalgamation
     n : the combination of two or more commercial companies syn: merger,
          uniting
see also:
merger uniting 

[3] : Moby Thesaurus II by Grady Ward, 1.0

103 moby thesaurus words for "amalgamation":
   anschluss, addition, admixture, affiliation, agglomeration,
   aggregation, agreement, alignment, alliance, alloy, alloyage,
   amalgam, assimilation, association, blend, blending, cabal,
   cahoots, cartel, centralization, coadunation, coalescence,
   coalescing, coalition, colleagueship, collegialism, collegiality,
   combination, combine, combo, comminglement, commingling,
   commixture, composite, composition, compost, compound, comradeship,
   confederacy, confederation, confraternity, congeries,
   conglomeration, conjugation, conjunction, consolidating,
   consolidation, conspiracy, copartnership, copartnery, eclecticism,
   ecumenism, embodiment, encompassment, enosis, federalization,
   federation, fellowship, fraternalism, fraternity, fraternization,
   freemasonry, fusing, fusion, hookup, immixture, inclusion,
   incorporation, integration, interfusion, interlarding,
   interlardment, interminglement, intermingling, intermixture,
   joining, junction, junta, league, marriage, meld, melding, merger,
   mingling, mixing, mixture, package, package deal, partnership,
   pluralism, sodality, solidification, sorority, syncretism,
   syndication, syneresis, synthesis, tie-in, tie-up, unification,
   union, uniting, wedding

Amalgamation >> A Words
Amalgamation, definition of term: Amalgamation
amalgamation_pag1.html