The Assumption of Mary is one of the four Marian dogmas of the Catholic Church. Pope Pius XII defined it on 1 November 1950 in his apostolic constitution Munificentissimus Deus as follows:
We pronounce, declare, and define it to be a divinely revealed dogma: that the Immaculate Mother of God, the ever Virgin Mary, having completed the course of her earthly life, was assumed body and soul into heavenly glory.
The declaration was built upon the 1854 dogma of the Immaculate Conception of Mary, which declared that Mary was conceived free from original sin, and both have their foundation in the concept of Mary as the Mother of God. It leaves open the question of whether Mary died or whether she was raised to eternal life without bodily death.
Wikipedia https://en.wikipedia.org/wiki/Assumption_of_Mary
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