Source : Webster's Revised Unabridged Dictionary (1913)

Consubstantiation \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.

Source : WordNet®

consubstantiation
     n : the doctrine of the High Anglican Church that after the
         consecration of the Eucharist the substance of the body
         and blood of Christ coexists with the substance of the
         consecrated bread and wine