Oikoumene
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Oikoumene, from the Greek Οικουμένη, which is the present participle of the verb Οικώ, meaning to inhabit.
Oikoumene usually refers to the part of the Earth that is inhabited, by all men or by only a subset of men. Often it referred to the lands inhabited by Greeks, excluding therefore the lands inhabited by Barbarians.
In the new testament, Oikoumene is used to refer to the future kingdom of Christ (the world to come), as in Hebrews 2.5: For unto the angels hath he not put in subjection the world to come, whereof we speak.
The concept underlies both the title Ecumenical Patriarch (Οικουμενικον Πατριαρχειον) given to the Patriarch of Constantinople, and the process of ecumenism.