baptism

nouns

a Christian sacrament signifying spiritual cleansing and rebirth
"most churches baptize infants but some insist on adult baptism"
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is a type of (narrower)
a formal religious ceremony conferring a specific grace on those who receive it; the two Protestant ceremonies are baptism and the Lord's Supper; in the Roman Catholic Church and the Eastern Orthodox Church there are seven traditional rites accepted as instituted by Jesus: baptism and confirmation and Holy Eucharist and penance and holy orders and matrimony and extreme unction