the Immaculate Conception
noun [ S ] uk/ɪˌmæk.jʊ.lət kənˈsep.ʃən/ us/ɪˌmæk.jʊ.lət kənˈsep.ʃən/
无沾成胎（说）（基督教认为圣母马利亚及耶稣基督成胎时未沾染原罪）
the Christian belief that Jesus Christ's mother Mary, or, more generally, Jesus Christ himself, was born free from sin (= offence against religious law)