The Collaborative International Dictionary of English v.0.48:

Purveyance \Pur*vey"ance\, n. [Cf. F. pourvoyance.]
   1. The act or process of providing or procuring; providence;
      foresight; preparation; management. --Chaucer.
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            The ill purveyance of his page.       --Spenser.
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   2. That which is provided; provisions; food.
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   3. (Eng. Law) A providing necessaries for the sovereign by
      buying them at an appraised value in preference to all
      others, and oven without the owner's consent. This was
      formerly a royal prerogative, but has long been abolished.
      --Wharton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

purveyance
    n 1: the act of supplying something