The Magisterium is the "teaching authority of the Roman Catholic Church". The word is derived from Latin magistra, which originally meant the office of a president, chief, director, superintendent, etc. (in particular, though rarely, the office of tutor or instructor of youth, tutorship, guardianship) or teaching, instruction, advice. "The task of interpreting the Word of God authentically has been entrusted solely to the Magisterium of the Church, that is, to the Pope and to the bishops in communion with him."