The Collaborative International Dictionary of English v.0.48:

Commingle \Com*min"gle\, v. t. & i. [imp. & p. p. Commingled;
   p. pr. & vb. n. Commingling.]
   To mingle together; to mix in one mass, or intimately; to
   blend. --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

commingle
    v 1: mix or blend; "His book commingles sarcasm and sadness"
    2: mix together different elements; "The colors blend well"
       [syn: blend, flux, mix, conflate, commingle,
       immix, fuse, coalesce, meld, combine, merge]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "commingle":
   admix, alloy, amalgamate, bemingle, blend, coalesce, combine,
   commix, compose, compound, concoct, conglomerate, emulsify, fuse,
   hash, homogenize, immingle, immix, integrate, interblend,
   interlace, interlard, intermingle, intermix, intertwine,
   interweave, jumble, knead, merge, mingle, mingle-mangle, mix,
   mix up, scramble, shuffle, stir up, syncretize, throw together,
   toss together, unify, work