The Collaborative International Dictionary of English v.0.48:

Commeasurable \Com*meas"ur*a*ble\, a. [Cf. Commensurable.]
   Having the same measure; commensurate; proportional.
   [1913 Webster]

         She being now removed by death, a commeasurable grief
         took as full possession of him as joy had done. --I.
                                                  Walton.
   [1913 Webster]