abstract
| - The Introit (from Latin: introitus, "entrance") is part of the opening of the celebration of the Roman Catholic Mass and the Lutheran Divine Service. Specifically, it refers to the antiphon that is spoken or sung at the beginning of the celebration. It is part of the Proper of the Mass; that is, the part that changes over the liturgical year. In the Roman Rite it is known as the antiphona ad introitum (Entrance antiphon), as in the text for each day's Mass, or as the cantus ad introitum (Entrance chant) as in the General Instruction of the Roman Missal, 47 and as in the First Roman Ordo (sixth to seventh century). In pre-1970 editions of the Roman Missal, the word Introitus was used, distinguished from the normal meaning of the word (entrance) by being capitalized. In Ambrosian chant and Beneventan chant, the counterpart of the Introit is called the "ingressa". In the Mozarabic, Carthusian, Dominican, and Carmelite Rites, it is called the "officium".
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