Rebaptize is a term used to describe the act of baptizing an individual who has already been baptized previously. Some synonyms for this term include rechristen, reinitiate, and reinduct. Another more modern synonym that is frequently used is "re-affirm." Rebaptism is typically practiced among certain religious groups who believe that the first baptism did not satisfy the religious requirements. Many religious traditions including the Catholic church, do not practice rebaptism. Instead, they recognize the first baptism as a valid and permanent commitment. Regardless of your religious beliefs, it's useful to have an understanding of these synonyms in case you come across them in your studies of religion or history.