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Transubstantiation
Transubstantiation is the alleged process whereby the bread and wine offered up at the communion service has its substance changed to that of the body, blood, soul and divinity of Jesus Christ while its accidents appear to be that of bread and wine. What looks like, tastes like, etc., bread and wine is actually another substance altogether. How this happens is a mystery and defies logic. How it can happen would require a miracle.
Transubstantiation is also known as the doctrine of the real presence.