Opus Dei. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/opus-dei
short for The Prelature of the Holy Cross and Opus Dei, a Roman Catholic organization composed of a prelate, secular clergy and lay people whose mission is to spread the Catholic teaching that everyone is called to become a saint; its lay members, men and women, engage in the affairs of the world and seek to direct them "according to God's will".
English Wiktionary. Available under CC-BY-SA license.