1. A member of the Roman Catholic Church.
2. The Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy; Also called: Western Church, Roman Catholic Church, Church of Rome, Roman Church.

Of, relating to, or being a Christian church having a hierarchy of priests and bishops under the pope, a liturgy centered in the Mass, veneration of the Virgin Mary and saints, clerical celibacy, and a body of dogma including transubstantiation and papal infallibility