Analysis of information sources in references of the Wikipedia article "Church (congregation)" in English language version.
O.E. cirice "church," from W.Gmc. *kirika, from Gk. kyriake (oikia) "Lord's (house)," from kyrios "ruler, lord."
Gk. kyriakon (adj.) "of the Lord" was used of houses of Christian worship since c. 300, especially in the East, though it was less common in this sense than ekklesia or basilike.