The Collaborative International Dictionary of English v.0.48:

Procuracy \Proc"u*ra*cy\, n.; pl. Procuracies. [LL.
   procuratia: cf. F. procuratie. See Procuration, and cf,.
   Proxy.]
   [1913 Webster]
   1. The office or act of a proctor or procurator; management
      for another.
      [1913 Webster]

   2. Authority to act for another; a proxy. [Obs.]
      [1913 Webster]