The Collaborative International Dictionary of English v.0.48:

Matter \Mat"ter\, v. i. [imp. & p. p. Mattered; p. pr. & vb.
   n. Mattering.]
   1. To be of importance; to import; to signify.
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            It matters not how they were called.  --Locke.
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   2. To form pus or matter, as an abscess; to maturate. [R.]
      "Each slight sore mattereth." --Sir P. Sidney.
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