one who assists the priest at the celebration of the holy eucharist by lighting the altar tapers, arranging the books, bringing bread, wine, and water for the sacrifice, and by making the appointed responses in the name and behalf of the assembled congregation. He was sometimes called "adjutor." The Clugniacs allowed one server, but the Cistercians, in obedience to pope Soter's injunction and the plural wording of the Dominus vobiscum, required always two.