The Collaborative International Dictionary of English v.0.48:

interweave \in`ter*weave"\, v. t. [imp. & obs. p. p.
   interwove; p. p. interwoven; p. pr. & vb. n.
   interweaving.]
   [1913 Webster]
   1. To weave together; to intermix or unite in texture or
      construction; to intertwine; as, threads of silk and
      cotton interwoven.
      [1913 Webster]

            Under the hospitable covert nigh
            Of trees thick interwoven.            --Milton.
      [1913 Webster]

   2. To intermingle; to unite intimately; to connect closely;
      as, to interweave truth with falsehood. --Dryden.
      [1913 Webster]

            Words interwove with sighs found out their way.
                                                  --Milton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

interweave
    v 1: interlace by or as if by weaving [syn: weave,
         interweave] [ant: unweave]

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "interweave":
   admix, alloy, amalgamate, associate, bemingle, blend, braid, coact,
   coalesce, combine, commingle, commix, compose, compound, concoct,
   conglomerate, cooperate, dovetail, emulsify, engage, enlace,
   entwine, fuse, hash, homogenize, immingle, immix, integrate,
   interact, interblend, interchange, interknit, interlace, interlard,
   intermesh, intermingle, intermix, interplay, intertie, intertissue,
   intertwine, intertwist, interwork, intort, join, jumble, knead,
   knit, lace, link, loom, loop, mat, merge, mesh, mingle,
   mingle-mangle, mix, mix up, mortise, net, noose, plait, pleach,
   raddle, scramble, shuffle, splice, stir up, syncretize,
   throw together, tissue, toss together, twill, twine, twist, wattle,
   weave, web, work, wreathe