What is "oikeiosis"

In Stoic ethics, oikeiôsis is a technical term variously translated as "appropriation," "orientation," "familiarization," "affinity," "affiliation," and "endearment." Oikeiôsis signifies the perception of something as one’s own, as belonging to oneself. The theory of oikeiôsis can be traced back to the work of the first Stoic philosopher, Zeno of Citium. The Stoic philosopher Hierocles saw it as the basis for all animal impulses as well as human ethical action. According to Porphyry, "those who followed Zeno stated that oikeiôsis is the beginning of justice".