Perichoresis

Perichoresis (from Greek: περιχώρησις perikhōrēsis, "rotation") describes the relationship between each person of the triune God (Father, Son, and Holy Spirit). The word circumincession (later circuminsession) is also used to mean the same idea. The term, as used in Christian theology, was first used by the Church Fathers. It is now reinvigorated among contemporary figures such as Jürgen Moltmann, Miroslav Volf, John Zizioulas and C. Baxter Kruger, and others. The noun first appears in the writings of Maximus Confessor (d. 662) but the related verb perichoreo is found earlier in Gregory of Nazianzus (d. 389/90). Gregory used it to describe the relationship between the divine and human natures of Christ as did John of Damascus (d. 749) but he also extended it to the "interpenetration" of the three persons of the Trinity and it became a technical term for the latter.

Modern authors extend the original usage as an analogy to cover other interpersonal relationships. The term "co(-)inherence" is sometimes used as a synonym.