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Welsh word eglwys comes from Ancient Greek ἐκκλησία, Ancient Greek ἐκκλησίᾱ, and later Latin ecclesia (Church (a house of worship).)
ἐκκλησία (Ancient Greek)
ἐκκλησίᾱ (Ancient Greek)
ecclesia (Latin)
Church (a house of worship).
eglwys (Welsh)
Church.