ABSTRACT
To provide an overall view of Theodoret’s way of using various expressions, in this chapter I summarise the most important terminological issues. We begin with the four basic expressions concerning the notions of ‘essence’, ‘nature’ and ‘person’ (ousia, physis, hypostasis and proso¯pon), then continue with the terms defining the union (heno¯sis, synapheia, koino¯nia, enoike¯sis), referring also to those that Theodoret considered inappropriate for the union (synchusis = mingling, trope¯ = change, chrasis = mixture, metabole¯ = alteration), as well as to the image of soul and body describing the oikonomia.
