ecumenical (adj.)
late 16c., "representing the entire (Christian) world," formed in English as an ecclesiastical word, from Late Latin oecumenicus "general, universal," from Greek oikoumenikos, from he oikoumene ge "the inhabited world (as known to the ancient Greeks); the Greeks and their neighbors considered as developed human society," from oikoumenos, present passive participle of oikein "inhabit," from oikos "house, habitation" (see villa).