The Collaborative International Dictionary of English v.0.48:

Mingle \Min"gle\, v. t. [imp. & p. p. Mingled; p. pr. & vb. n.
   Mingling.] [From OE. mengen, AS. mengan; akin to D. & G.
   mengen, Icel. menga, also to E. among, and possibly to mix.
   Cf. Among, Mongrel.]
   [1913 Webster]
   1. To mix; intermix; to combine or join, as an individual or
      part, with other parts, but commonly so as to be
      distinguishable in the product; to confuse; to confound.
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            There was . . . fire mingled with the hail. --Ex.
                                                  ix. 24.
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   2. To associate or unite in society or by ties of
      relationship; to cause or allow to intermarry; to
      intermarry.
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            The holy seed have mingled themselves with the
            people of those lands.                --Ezra ix. 2.
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   3. To deprive of purity by mixture; to contaminate.
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            A mingled, imperfect virtue.          --Rogers.
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   4. To put together; to join. [Obs.] --Shak.
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   5. To make or prepare by mixing the ingredients of.
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            [He] proceeded to mingle another draught.
                                                  --Hawthorne.
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WordNet (r) 3.0 (2006):

mingling
    n 1: the action of people mingling and coming into contact; "all
         the random mingling and idle talk made him hate literary
         parties"

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "mingling":
   admixture, alloyage, amalgamation, blending, coalescence,
   combination, comminglement, commingling, commixture, composition,
   eclecticism, fusion, immixture, integration, interfusion,
   interlarding, interlardment, interminglement, intermingling,
   intermixture, merger, mixing, mixture, pluralism, syncretism