\Con`sub*stan`ti*a"tion\ (?; 106), n.
1. An identity or union of substance.

2. (Theol.) The actual, substantial presence of the body of
   Christ with the bread and wine of the sacrament of the
   Lord's Supper; impanation; -- opposed to
   transubstantiation.

Note: This view, held by Luther himself, was called
      consubstantiation by non Lutheran writers in
      contradistinction to transsubstantiation, the Catholic
      view.