Immaculate Conception

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Catholic doctrine that the Virgin Mary was preserved by God from the transmission of Original sin at the time of her own conception. It is not, as is popularly believed, another name for the doctrine of Virgin birth. Immaculate Conception was announced by Pope Pius IX in his constitution Ineffabilis Deus, published December 8, 1854 (the Feast of the Immaculate Conception), speaking ex cathedra using the doctrine of papal infallibility.