Irvingism refers to a religious movement founded by Edward Irving in the 19th century that believed in the supernatural gifts of the Holy Spirit. Synonyms for Irvingism include Irvingite, Catholic Apostolic Church, and the Apostolic Church. These terms all refer to the same movement and belief system. While the movement has had a historical impact, it is not a widely recognized or practiced religion today. The term Irvingism is often used in academic and historical contexts, particularly in discussions of charismatic and Pentecostal movements in Christianity. Despite the decline of Irvingism as a movement, it remains an important part of Christian history and theology.