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:''This article is about ancient Greek households. For the ecology journal, see Oikos (journal). For the international sustainability-oriented student association, see Oikos International.''
An 'oikos' (ancient Greek: οίκος, plural: οίκοι) is the ancient Greek equivalent of a household, house, or family.
In Ancient Greek literature, the nature of the Oikos was prevalent, and indeed, the cornerstone of this ancient society. However, in the 5th century B.C., ancient Greek writers orientated the nature of the Oikos with the Polis (the city state); the conflict between these two was addressed in Greek Tragic theatre. The conflicting interests with both the Oikos and Polis lead to the structural decay of the society.
An ''oikos'' was the basic unit of society in most Greek city-states, and included the head of the ''oikos'' (usually the oldest male), his extended family (wife and children), and slaves living together in one domestic setting. Large ''oikoi'' also had farms that were usually tended by the slaves, which were also the basic agricultural unit of the ancient economy.
The Greek "oikos" differed significantly from the Roman "domus" in architectural layout, although Greece was part of the Roman Empire for a long time. It was built around paved peristyles and had very distinct male and female spaces.
The first part of the house consisted of a "gynaeconitis," or peristyle, with the "oecus", the center of domestic activity, beyond. This latter area consisted of bedrooms and dining rooms.
The second part of the house, the "andronitides," was the locus of male activity. There one could find more dining rooms, guest suites, and libraries.

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In modern sociology

In modern sociology

The term ''oikos'' is now also used to describe the social groups and people with whom the most time is spent. Several dozen to several hundred people may be known, but the quality time spent with others is extremely limited: only those to whom quality (face-to-face) time is devoted can be said to be a part of an ''oikos''. Each individual has a primary group that includes relatives and friends who relate to the individual through work, recreation, hobbies, or our neighbors. The modern ''oikos'', however, includes people that share some sort of social interaction, be it through conversation or simple relation, for at least a total of one hour per week.