Quick definitions from WordNet (Dormition)
▸ noun: celebration in the Eastern Orthodox church of the Virgin Mary's being taken up into heaven when her earthly life ended; corresponds to the Assumption in the Roman Catholic church and is also celebrated on August 15th
▸ noun: celebration in the Eastern Orthodox church of the Virgin Mary's being taken up into heaven when her earthly life ended; corresponds to the Assumption in the Roman Catholic church and is also celebrated on August 15th