sacrament -
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
sacrament -
A sacred act or ceremony in Christianity. In Roman Catholic theology, a sacrament is defined as "an outward sign instituted by Christ to give grace. ".
Wikipedia
A sacrament, as defined in Hexam's Concise Dictionary of Religion is what Roman Catholics believe to be "a rite in which God is uniquely active. " Augustine of Hippo defined a Christian sacrament as "a visible sign of an invisible reality. " The Anglican Book of Common Prayer speaks of them as "an outward and visible sign of an inward and invisible Grace.
OmegaWiki Dictionary
Ω
sacrament A sacred act or ceremony in Christianity.