Wordnet 3.0
NOUN (1)
1. 
 celebration in the Roman Catholic Church of the Virgin Mary's being taken up into heaven when her earthly life ended; 
 corresponds to the Dormition in the Eastern Orthodox Church; 
[syn: Assumption, Assumption of Mary, August 15]
WordNet (r) 3.0 (2006):
Assumption of Mary
    n 1: celebration in the Roman Catholic Church of the Virgin
         Mary's being taken up into heaven when her earthly life
         ended; corresponds to the Dormition in the Eastern Orthodox
         Church [syn: Assumption, Assumption of Mary, August
         15]