The word
miaphysite derives from the
Ancient Greek μία (
mía; "one") and
φύσις (
phúsis; "nature"). Miaphysites claim that the teaching is based on
Cyril of Alexandria's formula
mia physis tou theou logou sesarkomene, meaning "One incarnate
physis of God the Word" (or "One enfleshed
physis..."). The word
sesarkomene (meaning "enfleshed") is given in the nominative feminine case, and hence is describing the
physis as incarnate. This is often incorrectly translated as "One
physis of God the incarnate Word", which would require the genitive masculine case
sesarkomenou. This is disputed, with the scholarly consensus suggesting that this formula originated from the writings of the
Apollinaris of Laodicea, who espoused a form of
monophysitism called
Apollinarism. and was also explicitly rejected by Cyril in his First Letter to Succensus, though Cyril does support the
mia physis formula in the same letter. The 451
Council of Chalcedon used
physis to mean a set of properties appropriate to an
ousia (essence), and defined that there is in Christ one
hypostasis but two
physeis (natures). It is disputed whether Cyril used
physis in that sense.
John Anthony McGuckin says that in Cyril's formula "
physis serves as a rough semantic equivalent to
hypostasis". The 431
Council of Ephesus used
physis to signify the single subjecthood of Christ and also condemned speaking of two
physeis (natures) in various homilies contained within the official
minutes. Others interpret the miaphysite term
physis in line with its use by the Council of Chalcedon and speak of "miaphysitism" as "
monophysitism", a word used for all forms of denial of the Chalcedonian doctrine. However, they add that "miaphysitism" is "the more accurate term for the position held by the Syriac, Coptic and Armenian churches". The
Second Council of Constantinople, held in 553 following Chalcedon, accepted Cyril's phrase but warned against misinterpreting it. Etymologically,
mia‑physis and
mono‑physis both mean 'one nature'. However,
mia‑physis has come to denote the specific
Severian theology that understands the union of Christ's natures as a single nature by composition, interpreted by Miaphysites as Cyrillian (the formula
mia physis being drawn from his writings), rather than the
Eutychian view of union by mixing or other forms of 'one‑nature' (monophysite) theology (e.g., one purely human nature, one purely divine nature). Strictly speaking, by meaning alone, Miaphysites (Severians) are a type of monophysite, but a distinct kind and not to be confused with other non‑miaphysite monophysites (such as Eutychians or
Ebionites). In recent times, Miaphysites have adopted "miaphysite" as a self‑designation; conversely, "monophysite" has been used to label non‑miaphysite monophysites (especially Eutychians) and is considered by many miaphysites to be pejorative and inaccurate to describe their theology. The broad term "
dyophysitism" covers not only Chalcedonian teaching but also interpretations like
Nestorianism which held that Jesus is not only
of two natures but is in fact two centers of attribution, which may imply two persons, a view nominally rejected by Chalcedonians. Likewise, "monophysitism" includes both Oriental Orthodox teaching and Eutychianism, the latter maintaining that after the union, the eternal Son possessed a single synthesized nature, neither purely divine nor purely human, identical with neither. Miaphysites reject Eutychianism: they hold that the incarnate Christ has one nature that is fully divine and fully human, retaining the properties of both without mingling, confusion ("pouring together"), or change. To avoid confusion with Eutychians, the
Oriental Orthodox Churches reject the label "monophysite". The Coptic Metropolitan Bishop of Damiette declared it a misnomer to call them monophysites, for "they always confessed the continuity of existence of the two natures in the one incarnate nature of the Word of God. Non[e] of the natures ceased to exist because of the union and the term 'mia physis' denoting the incarnate nature is completely different from the term 'monophysites' [...] The Oriental Orthodox do not believe in a single nature in Jesus Christ but rather a united divine-human nature." The Agreed Statement by the
Anglican–Oriental Orthodox International Commission in 2014 also declared: == Conflict ==