The Collaborative International Dictionary of English v.0.48:

Intertwine \In`ter*twine"\, v. t.
   To unite by twining one with another; to entangle; to
   interlace. --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Intertwine \In`ter*twine"\, v. i.
   To be twined or twisted together; to become mutually involved
   or enfolded.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Intertwine \In`ter*twine"\, n.
   The act of intertwining, or the state of being intertwined.
   --Coleridge.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "intertwine":
   admix, alloy, amalgamate, 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,
   intertwist, interweave, interwork, intort, jumble, knead, knit,
   lace, 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