orthodoxos

Orthodoxos is a term used in several languages, notably Spanish and Greek, derived from the Greek orthódoxos meaning "right opinion" or "correct belief." In religious contexts, orthodoxos most often refers to adherents of the Eastern Orthodox Church, a communion of autocephalous churches that share a common theology, liturgy, and sense of apostolic succession. The term also appears as an adjective meaning "orthodox" in the sense of conforming to traditional or established doctrine.

The Eastern Orthodox Church traces its roots to the early Christian church and the decisions of the first seven ecumenical councils. Its member churches include the Ecumenical Patriarchate of Constantinople, the Russian Orthodox Church, the Greek Orthodox Church, and many others across Europe, the Middle East, and the Americas. Core beliefs include the Nicene Creed, the sacraments (especially baptism and the Eucharist), the doctrine of the Trinity, and the veneration of icons. Liturgy is central, with the Divine Liturgy as the principal service; churches are organized along a hierarchical structure of bishops, with regional patriarchs and synods.

Historically, orthodoxy has been distinguished from Western Catholicism since the Great Schism of 1054 and from Protestant movements that emerged later. The term is also used more broadly to describe anything considered conforming to traditional or accepted doctrine within a religious tradition, or even beyond religion as "orthodox" in the sense of standard or conventional.