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:

Stitching \Stitch"ing\, n.
   1. The act of one who stitches.
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   2. Work done by sewing, esp. when a continuous line of
      stitches is shown on the surface; stitches, collectively.
      [1913 Webster]

WordNet (r) 3.0 (2006):

stitching
    n 1: joining or attaching by stitches [syn: sewing,
         stitching]