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Consubstantiation is a theological doctrine that (like Transubstantiation) attempts to describe the nature of the Christian Eucharist in concrete metaphysical terms. It holds that during the sacrament, the fundamental "substance" of the body and blood of Christ are present alongside the substance of the bread and wine, which remain present.
Use
The doctrine of consubstantiation is often held in contrast to the doctrine of transubstantiation. While some Lutherans use the term "consubstantiation" to describe their doctrine, many reject it as not accurately reflecting the eucharistic doctrine of Martin Luther, the sacramental union. They reject the concept of consubstantiation because it replaces what they believe to be the biblical doctrine with a philosophical construct and because it implies that the body and blood are physically present in the same way as the bread and wine, rather than being present in an "illocal", supernatural way.
In England in the late 14th century, there was a political and religious movement known as Lollardy. Among much broader goals, the Lollards affirmed a form of consubstantiation—that the Eucharist remained physically bread and wine, while becoming spiritually the body and blood of Christ. Lollardy survived up until the time of the English Reformation.
Literary critic Kenneth Burke's dramatism takes this concept and utilizes it in secular rhetorical theory to look at the dialectic of unity and difference within the context of logology.