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.
      [1913 Webster]

            There was . . . fire mingled with the hail. --Ex.
                                                  ix. 24.
      [1913 Webster]

   2. To associate or unite in society or by ties of
      relationship; to cause or allow to intermarry; to
      intermarry.
      [1913 Webster]

            The holy seed have mingled themselves with the
            people of those lands.                --Ezra ix. 2.
      [1913 Webster]

   3. To deprive of purity by mixture; to contaminate.
      [1913 Webster]

            A mingled, imperfect virtue.          --Rogers.
      [1913 Webster]

   4. To put together; to join. [Obs.] --Shak.
      [1913 Webster]

   5. To make or prepare by mixing the ingredients of.
      [1913 Webster]

            [He] proceeded to mingle another draught.
                                                  --Hawthorne.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mingle \Min"gle\, v. i.
   1. To become mixed or blended.
      [1913 Webster]

   2. To associate (with certain people); as, he's too
      highfalutin to mingle with working stiffs.
      [PJC]

   3. To move (among other people); -- of people; as, the
      president left his car to mingle with the crowd; a host at
      a a party should mingle with his guests.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Mingle \Min"gle\, n.
   A mixture. [Obs.] --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mingle
    v 1: to bring or combine together or with something else;
         "resourcefully he mingled music and dance" [syn: mix,
         mingle, commix, unify, amalgamate]
    2: get involved or mixed-up with; "He was about to mingle in an
       unpleasant affair"
    3: be all mixed up or jumbled together; "His words jumbled"
       [syn: jumble, mingle]

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "mingle":
   admix, alloy, amalgamate, associate, associate with, assort with,
   bemingle, blend, chum, chum together, chum with, circulate, clique,
   clique with, club together, coalesce, combine, commingle, commix,
   compose, compound, concoct, conglomerate, consort, consort with,
   emulsify, fellowship, flock together, fraternize, fuse, go,
   hang around with, hang out with, hash, herd together, hobnob with,
   homogenize, immingle, immix, integrate, interblend, interlace,
   interlard, intermingle, intermix, intertwine, interweave, join,
   join in fellowship, jumble, keep company with, knead, make up,
   marry, meld, merge, mingle with, mingle-mangle, mix, mix up,
   mix with, pal, pal up with, pal with, run in couples, run with,
   scramble, shuffle, socialize, sort with, spend time, stir up,
   syncretize, take up with, throw together, tie up with,
   toss together, unite, work