Eastern Church, n.
 the Catholic Church as it existed in the Byzantine Empire
the Catholic Church as it existed in the Byzantine Empire  
<noun.group>
Byzantine Church Eastern Church
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 derived from the Byzantine Church and adhering to Byzantine rites
derived from the Byzantine Church and adhering to Byzantine rites  
<noun.group>
Eastern Church Eastern Orthodox Eastern Orthodox Church Orthodox Catholic Church Orthodox Church
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member of this domain (topic)
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