Congo River mentioned in 1535. Abraham Ortelius in his world map of 1564 labeled as "Manicongo" the city at the mouth of the river. The tribal names in "Kongo" possibly derive from a word for a public gathering or tribal assembly. The modern name of the Kongo people or "Bakongo" was introduced in the early 20th century. The name "Zaire" is from a Portuguese adaptation of a Kikongo word, ("river"), a truncation of ("river swallowing rivers"). The river was known as "Zaire" during the 16th and 17th centuries; "Congo" seems to have replaced "Zaire" gradually in English usage during the 18th century,
Zaire Use in an African context, inspired by the liturgical reform initiated at the Second Vatican Council. Zaire Use The Zaire Use () or Roman Missal for the Dioceses of Zaire is a variation of the common Mass of the Roman Catholic Church. While containing many of the elements of the Ordinary Form of the Mass of the Roman Rite, it incorporates elements from sub-Saharan African culture, a process referred to as "inculturation". Promulgated by the decree Zairensium on April 30, 1988, by the Congregation for Divine Worship and the Discipline of the Sacraments, the "Missel romain pour les diocèses du Zaïre"