The Collaborative International Dictionary of English v.0.48:

Stitch \Stitch\, v. t. [imp. & p. p. Stitched; p. pr. & vb. n.
   Stitching.]
   1. To form stitches in; especially, to sew in such a manner
      as to show on the surface a continuous line of stitches;
      as, to stitch a shirt bosom.
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   2. To sew, or unite together by stitches; as, to stitch
      printed sheets in making a book or a pamphlet.
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   3. (Agric.) To form land into ridges.
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   To stitch up, to mend or unite with a needle and thread;
      as, to stitch up a rent; to stitch up an artery.
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The Collaborative International Dictionary of English v.0.48:

Stitch \Stitch\, n. [OE. stiche, AS. stice a pricking, akin to
   stician to prick. See Stick, v. i.]
   1. A single pass of a needle in sewing; the loop or turn of
      the thread thus made.
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   2. A single turn of the thread round a needle in knitting; a
      link, or loop, of yarn; as, to let down, or drop, a
      stitch; to take up a stitch.
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   3. [Cf. OE. sticche, stecche, stucche, a piece, AS. stycce.
      Cf. Stock.] A space of work taken up, or gone over, in a
      single pass of the needle; hence, by extension, any space
      passed over; distance.
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            You have gone a good stitch.          --Bunyan.
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            In Syria the husbandmen go lightly over with their
            plow, and take no deep stitch in making their
            furrows.                              --Holland.
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   4. A local sharp pain; an acute pain, like the piercing of a
      needle; as, a stitch in the side.
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            He was taken with a cold and with stitches, which
            was, indeed, a pleurisy.              --Bp. Burnet.
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   5. A contortion, or twist. [Obs.]
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            If you talk,
            Or pull your face into a stitch again,
            I shall be angry.                     --Marston.
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   6. Any least part of a fabric or dress; as, to wet every
      stitch of clothes. [Colloq.]
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   7. A furrow. --Chapman.
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   8. An arrangement of stitches, or method of stitching in some
      particular way or style; as, cross-stitch; herringbone
      stitch, etc.
      [Webster 1913 Suppl.]

   Chain stitch, Lock stitch. See in the Vocabulary.

   Pearl stitch, or Purl stitch. See 2nd Purl, 2.
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The Collaborative International Dictionary of English v.0.48:

Stitch \Stitch\, v. i.
   To practice stitching, or needlework.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stitch
    n 1: a link or loop or knot made by an implement in knitting,
         crocheting, embroidery, or sewing
    2: a sharp spasm of pain in the side resulting from running
    v 1: fasten by sewing; do needlework [syn: sew, run up, sew
         together, stitch]

Moby Thesaurus II by Grady Ward, 1.0:

161 Moby Thesaurus words for "stitch":
   French knot, ache, acute pain, ankle, articulate, articulation,
   batten, batten down, bit, bite, bolt, boring pain, boundary,
   buckle, butt, button, cervix, chain stitch, charley horse, chip,
   chunk, clasp, cleat, clinch, clip, clipping, closure, collop,
   connecting link, connecting rod, connection, coupling, cramp,
   cramps, crick, cross-stitch, crumb, cut, cutting, darting pain,
   dollop, dovetail, elbow, embrace, end, fragment, fulgurant pain,
   girdle pain, gliding joint, gnawing, gob, gobbet, griping, hasp,
   hinge, hinged joint, hip, hitch, hook, hunk, interface, jam, join,
   joining, joint, jumping pain, juncture, kink, knee, knuckle,
   lancinating pain, latch, link, lock, lump, misery, miter, modicum,
   moiety, morceau, morsel, mortise, nail, neck, needle, needlepoint,
   nip, pang, paring, paroxysm, particle, patch, peg, picot, piece,
   pin, pinch, pivot, pivot joint, prick, rabbet, rasher, rivet,
   scarf, scoop, scrap, screw, seam, seizure, sew, sew up, shard,
   sharp pain, shaving, shiver, shoot, shooting, shooting pain,
   shoulder, shred, skewer, slice, sliver, smithereen, snack, snap,
   snatch, snick, snip, snippet, spasm, splinter, stab, stabbing pain,
   staple, stick, stockinette, stump, suture, symphysis, tack, tag,
   tailor, tatter, thrill, throes, tie rod, toggle, toggle joint,
   tormen, treble, tweak, twinge, twitch, union, wedge, weld,
   whipstitch, wrench, wrist, zipper