A Christian theological belief that the bread and wine in communion become the actual body and blood of Christ while keeping their original substance.
From Latin 'con-' (together) + 'substantia' (substance) + Greek '-ism' (doctrine). The term emerged in medieval religious debate about the nature of communion, combining Latin and Greek roots to express a specific theological position about how two substances can coexist.
This word shows how religions created incredibly precise vocabulary to describe invisible spiritual changes—medieval theologians basically invented philosophical language to argue about whether bread stays bread while becoming Jesus's body, and different versions of this idea (consubstantiation vs. transubstantiation) split Christian churches for centuries.
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