The Collaborative International Dictionary of English v.0.48:

Affeer \Af*feer"\, v. t. [OF. aforer, afeurer, to tax, appraise,
   assess, fr. L. ad + forum market, court of justice, in LL.
   also meaning price.]
   1. To confirm; to assure. [Obs.] "The title is affeered."
      --Shak.
      [1913 Webster]

   2. (Old Law) To assess or reduce, as an arbitrary penalty or
      amercement, to a certain and reasonable sum.
      [1913 Webster]

            Amercements . . . were affeered by the judges.
                                                  --Blackstone.
      [1913 Webster] Affeerer