The Collaborative International Dictionary of English v.0.48:

Counterfaisance \Coun"ter*fai"sance\ (koun"t?r-f?"zans), n.
   See Counterfesance. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Counterfesance \Coun"ter*fe`sance\ (-f?"zans), n. [OF.
   contrefaisance, fr. contrefaire. See Counterfeit, a.]
   The act of forging; forgery. [Obs.] [Written also
   counterfaisance.]
   [1913 Webster]