Ecclesiastical . a ceremonial immersion in water, or application of water, as an initiatory rite or sacrament of the Christian church.

any similar ceremony or action of initiation, dedication, etc.

a trying or purifying experience or initiation.

Christian Science . purification of thought and character.

noun

ablution , baptismal , christening , debut , dedication , dunking , immersion , introduction , launching , lustration , purgation , purge , purification , rite of passage , ritual , sanctification , sprinkling , affusion , aspersion , baptism , baptistry , baptizing , beginning , catechumen , chrism , cleansing , eucharist , hypothetical , initiation , parabaptism , pedobaptism , sacrament