Ordain/ɔːrˈdeɪn/ Definition 1 of 3Pro Tip 1/3Religious Ceremony Used for a sacred ritual in Christianity to appoint someone to a clergy role. Sarah was ordained a minister in a beautiful ceremony. Pro Tip 2/3Personal Achievement Being ordained is a significant milestone in the life of someone religious. After years of study, he was finally ordained. Pro Tip 3/3Church Authority Only certain religious authorities, like bishops, have the power to ordain. The church council agreed to ordain two new priests.