Mass is the celebration of the Eucharist in the Western liturgical rites of the Roman Catholic Church, of Old Catholic Churches, of the Anglo-Catholic tradition of Anglicanism, and of some largely High Church Lutheran regions. In Scandinavian and Baltic countries, the Lutheran Eucharistic service is also known as "the Mass".
The term is derived from the late-Latin word missa (dismissal), a word used in the concluding formula of Mass in Latin: "Ite, missa est" ("Go; it is the dismissal").
For the celebration of the Eucharist in Eastern Churches, including those in full communion with the Holy See of Rome, other terms, such as the Divine Liturgy, the Holy Qurbana, and the Badarak, are normally used. Western denominations not in full communion with the Roman Catholic Church, such as Calvinist Christianity, also usually prefer terms other than Mass. For information on the theology of the Eucharist and on the Eucharistic liturgy of other Christian denominations, see "Eucharist" and "Eucharistic theology".