- the changing of one substance into another.
- the changing of the elements of the bread and wine, when they are consecrated in the Eucharist, into the body and blood of Christ (a doctrine of the Roman Catholic Church).
- (esp in Roman Catholic theology)
- the doctrine that the whole substance of the bread and wine changes into the substance of the body and blood of Christ when consecrated in the Eucharist
- the mystical process by which this is believed to take place during consecration
- a substantial change; transmutation
