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

admixture \admix"ture\ ?; 135, n. l. admiscere, admixtum, to
   admix; ad + miscere to mix. see mix.
   1913 webster
   1. the act of mixing; mixture.
      1913 webster

   2. the compound formed by mixing different substances
      together.
      1913 webster

   3. that which is mixed with anything.
      1913 webster
see also:
mix 

[2] : WordNet (r) 2.0

admixture
     n 1: the state of impairing the quality or reducing the value of
          something syn: alloy
     2: an additional ingredient that is added by mixing with the
        base; "the growing medium should be equal parts of sand
        and loam with an admixture of peat moss and cow manure";
        "a large intermixture of sand" syn: intermixture
     3: the act of mixing together; "paste made by a mix of flour
        and water"; "the mixing of sound channels in the recording
        studio" syn: mix, commixture, mixture, intermixture,
         mixing
see also:
alloy intermixture mix commixture mixture mixing 

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

49 moby thesaurus words for "admixture":
   accretion, addition, alloy, alloyage, amalgam, amalgamation, bit,
   blend, blending, coalescence, combination, combo, comminglement,
   commingling, commixture, composite, composition, compound,
   concoction, confection, dash, doctor, eclecticism, ensemble,
   fortification, fusion, immixture, integration, interfusion,
   interlarding, interlardment, interminglement, intermingling,
   intermixture, magma, merger, mingling, mix, mix-up, mixing,
   mixture, paste, pluralism, shade, smack, spice, syncretism, taint,
   tinge

Admixture >> A Words
Admixture, definition of term: Admixture
admixture_pag1.html