ecumene
All known inhabited and civilized areas of the world.
archaic
Near-synonym: civilization
Unification of Christianity and of Christendom.
Where it comes from
From Ancient Greek οἰκουμένη (oikouménē, “inhabited world”), from οἰκέω (oikéō, “I inhabit, dwell”), from οἶκος (oîkos, “residence”).
Adapted from the Wiktionary entry ecumene (CC BY-SA 4.0).