isomorphism class

from The Free On-line Dictionary of Computing (8 July 2008)

isomorphism class

   <mathematics> A collection of all the objects {isomorphic} to
   a given object.  Talking about the isomorphism class (of a
   {poset}, say) ensures that we will only consider its
   properties as a poset, and will not consider other incidental
   properties it happens to have.

   (1995-03-25)