What does catholicism mean?
Catholicism is the noun denoting the faith, doctrine, worship, and institutional life of the Catholic Church — most commonly the Roman Catholic Church, the largest Christian denomination in the world. It encompasses belief in the sacraments, the authority of the pope, the veneration of saints, and a continuous tradition of teaching stretching back to the early centuries of Christianity. The word derives from "catholic," an adjective rooted in the Greek katholikos, meaning "universal," reflecting the early church's claim to a faith intended for all people. In ordinary usage, one might say someone was raised in Catholicism, converted to it, or studies its history and theology. Because the term names an entire religious system rather than an individual believer, it functions much like "Protestantism" or "Orthodoxy": abstract, capitalized, and used to discuss tradition, culture, and doctrine at large rather than personal identity alone.
nounThe faith, doctrine, and practice of the Catholic Church, especially the Roman Catholic Church; also, more broadly, the body of beliefs and traditions held by Catholics.
- The doctrines, beliefs, and practices of the Roman Catholic Church.
- (Broader, less common) The faith and traditions of any of the Catholic churches, including Eastern Catholic churches in communion with Rome.
"He was raised in Catholicism but later explored other faiths."
"She converted to Catholicism shortly after moving to Rome."
"The course traces the history of Catholicism from the early church to the modern era."
Rarely used in the plural; occasionally appears in scholarly writing to refer collectively to different Catholic traditions or regional expressions of the faith.
"Scholars have compared the various Catholicisms that developed across Latin America."
The word "catholic" originally meant simply "universal" — which is why the early church called itself catholic long before there was a pope in Rome.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of catholicism
The word Catholicism comes from "Catholic," which derives from Late Latin catholicus and ultimately from the Greek katholikos, meaning "universal" or "general," from katholou ("as a whole"). Early Christians applied the term to the universal church as distinct from local congregations, and by the time English adopted the word in the medieval and early modern periods, it had become strongly associated with the Roman Church, particularly after the Reformation sharpened distinctions between Catholic and Protestant. Related words sharing this Greek root include "catholic" itself, "catholicity," and "catholicize."
Related word forms
How catholicism is actually used
Always capitalized when referring to the specific religious tradition. In academic and interfaith contexts, writers may distinguish "Roman Catholicism" from Eastern Catholic traditions, though in everyday use "Catholicism" typically means Roman Catholicism.
Easily confused with catholicism
"Catholic" (capitalized) refers to the Roman Catholic Church or its members, while lowercase "catholic" is an older adjective meaning universal or wide-ranging; "Catholicism" is the noun naming the faith itself.