noun. an act that changes the form or character or substance of something.
noun. the Roman Catholic doctrine that the whole substance of the bread and the wine changes into the substance of the body and blood of Christ when consecrated in the Eucharist.
Example sentences of the word transubstantiation
1. Noun, singular or mass
Children must believe in the doctrine of transubstantiation in order to experience communion, meaning that the consecrated bread and wine has become the body and blood of Christ.