noun
Assumption of Mary; the Assumption
Catholic feast celebrating the Virgin Mary's bodily ascent into heaven, observed on August 15.
See also: 聖母マリア
聖母被昇天の祝日は8月15日です。
The Feast of the Assumption is on August 15.
聖母マリア refers to the Virgin Mary herself, while 聖母被昇天 is the specific event or feast of her Assumption.
Compound of 聖母 (Virgin Mary) + 被昇天 (being taken up into heaven), a direct translation of the Latin 'Assumptio Beatae Mariae Virginis'.