the main group of Christian churches in Eastern Europe and southwest Asia, which was formed in the 11th century by separating from the Catholic Church. The Russian Orthodox Church, the main Christian group in Russia, is closely related.
the main religious group of Russia. It is a Christian church that began in the 11th century by separating from the Catholic Church. The Orthodox Church has very complicated religious ceremonies in which the words are mostly sung rather than spoken, and the it is closely related to the GREEK ORTHODOX CHURCH .