Word Origin & History
ecumenicalc.1570, formed in Eng. as an ecclesiastical word, as if from L. oecumenicus "general, universal," from Gk. 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, pr. passive participle
of oikein "inhabit," from oikos "house, habitation" (see
villa).