(n.) An identity or union of substance.
(n.) 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.
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Webster, Noah. Entry for 'Consubstantiation'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/c/consubstantiation.html. 1828.