The Collaborative International Dictionary of English v.0.48:

Assize \As*size"\, v. t. [imp. & p. p. Assized; p. pr. & vb.
   n. Assizing.] [From Assize, n.: cf. LL. assisare to
   decree in assize. Cf. Asses, v.]
   1. To assess; to value; to rate. [Obs.] --Gower.
      [1913 Webster]

   2. To fix the weight, measure, or price of, by an ordinance
      or regulation of authority. [Obs.]
      [1913 Webster]