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The Immaculate Conception refers to Mary’s preservation from original sin from the very moment of her conception. The formal definition of this dogma was given to the Church by Pope St. Pius IX in 1854:We declare, pronounce, and define that the doctrine which holds that the most Blessed Virgin Mary, in the first instance of her conception, by a singular privilege granted by Almighty God, in view of the merits of Jesus Christ, the Savior of the human race, was preserved free from all …