The Collaborative International Dictionary of English v.0.48:

Cognisor \Cog`ni*sor"\ (? or ?), Cognisee \Cog`ni*see\, n.
   See Cognizor, Cognizee.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

COGNISEE. He to whom a fine of lands, &c. is acknowledged. See Cognisor.