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The rite of baptism performed on a person who is entering the Roman Catholic Church and is not certain about previous baptism. This is not rebaptism, which is impossible, since this sacrament can be received only once. But if there is reasonable doubt about the fact or validity of one's previous baptism, the sacrament is administered conditionally, i.e., the one who performs the ritual at least mentally says, "If you are not baptized," and then proceeds to confer the sacrament.
All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.