What does "consubstantiation" mean?

Consubstantiation: (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.