

This word refers to the Oriental Orthodox belief in the one perfectly unified nature of Christ i.e., a complete union of the divine and human natures into one nature is self-evident in order to accomplish the divine salvation of mankind, as opposed to the " two natures of Christ" belief commonly held by the Latin and Eastern Catholic, Eastern Orthodox, Anglican, Lutheran and most other Protestant churches. Tewahedo ( Geʽez: ተዋሕዶ) is a Geʽez word meaning "united as one". It is one of the oldest Christian churches and Ethiopia is the second country historically, following only Armenia, to have officially proclaimed Christianity as its state religion (in AD 333).

The Ethiopian Orthodox Tewahedo Church had been administratively part of the Coptic Orthodox Church of Alexandria from the first half of the 4th century until 1959, when it was granted autocephaly with its own patriarch by Saint Pope Cyril VI of Alexandria, Pope of the Coptic Orthodox Church of Alexandria. The Ethiopian Orthodox Tewahedo Church is in communion with the Eritrean Orthodox Tewahedo Church, the Coptic Orthodox Church of Alexandria, the Malankara Orthodox Syrian Church, the Armenian Apostolic Church and the Syriac Orthodox Church, having gained autocephaly in 1959. It is a founding member of the World Council of Churches. One of the few Christian churches in Sub-Saharan Africa originating before European colonization of the continent, the Ethiopian Orthodox Tewahedo Church dates back millennia, and has a current membership of about 36 million people, the majority of whom live in Ethiopia. The Ethiopian Orthodox Tewahedo Church ( Amharic: የኢትዮጵያ ኦርቶዶክስ ተዋሕዶ ቤተ ክርስቲያን, Yäityop'ya ortodoks täwahedo bétäkrestyan) is the largest of Eastern Christianity's branch of Oriental Orthodox Christian churches.
