The Collaborative International Dictionary of English v.0.48:

Mat \Mat\, v. t. [imp. & p. p. Matted; p. pr. & vb. n.
   Matting.]
   1. To cover or lay with mats. --Evelyn.
      [1913 Webster]

   2. To twist, twine, or felt together; to interweave into, or
      like, a mat; to entangle.
      [1913 Webster]

            And o'er his eyebrows hung his matted hair.
                                                  --Dryden.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Matting \Mat"ting\, n. [From Mat, v. t. & i.]
   1. The act of interweaving or tangling together so as to make
      a mat; the process of becoming matted.
      [1913 Webster]

   2. Mats, in general, or collectively; mat work; a matlike
      fabric, for use in covering floors, packing articles, and
      the like; a kind of carpeting made of straw, etc.
      [1913 Webster]

   3. Materials for mats.
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   4. An ornamental border. See 3d Mat, 4.
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The Collaborative International Dictionary of English v.0.48:

Matting \Mat"ting\, n. [See Matte.]
   A dull, lusterless surface in certain of the arts, as
   gilding, metal work, glassmaking, etc.
   [1913 Webster]

WordNet (r) 3.0 (2006):

matting
    n 1: a covering of coarse fabric (usually of straw or hemp)
    2: mounting consisting of a border or background for a picture
       [syn: mat, matting]