The Collaborative International Dictionary of English v.0.48:

Connature \Con*na"ture\ (?; 135), n.
   Participation in a common nature or character. [R.]
   [1913 Webster]

         Connature was defined as likeness in kind between
         either two changes in consciousness, or two states of
         consciousness.                           --H. Spencer.
   [1913 Webster]