the part of Christendom that derives its liturgy, discipline, and traditions principally from the patriarchate of Rome, as contrasted with the part that derives these from the other ancient patriarchates, esp that ofConstantinople
2.
the Roman Catholic Church, sometimes together with the Anglican Communion of Churches
Western Church in American English
1. Obsolete
the Christian church in much of the western part of the Roman Empire
2.
that part of the Catholic Church which recognizes the pope and follows the Latin Rite; the Roman Catholic Church
3.
broadly, all the Christian churches of Western Europe and America