oikumene in English dictionary oikumene Meanings and definitions of "oikumene" The civilized world or inhabited world, referring to the location and time in the known world where human civilization exists. noun The civilized world or inhabited world, referring to the location and time in the known world where human civilization exists. more Grammar and declension of oikumene oikumene ( plural oikumenes) oikumene (plural oikumenes) more Sample sentences with "oikumene" Declension Stem Try again Authors