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Etymology

The word church is derived from Old English cirice, 'place of assemblage set aside for Christian worship', from the Proto-Germanic kirika. This was probably borrowed via the Gothic from the Greek kyriake (oikia), kyriakon doma, 'the Lord's (house)', from kyrios, 'ruler, lord'. Kyrios in turn comes from the Proto-Indo-European language root *keue meaning 'to swell'.

The Greek kyriakon, 'of the Lord', was used of houses of Christian worship since c. AD 300, especially in the East, although it was less common in this sense than ekklesia or basilike.