同性质的（拉丁语：consubstantialis，英语：Consubstantial），这个拉丁文形容词是一个特定的基督教神学用语，用来表达耶稣与上帝之间的关系，这个表述被称为同质论（英语：Consubstantiality）。它最早是拉丁教父特土良造出的拉丁文单字，用来翻译古希腊语：ὁμοούσιος（homoousios），以形容耶稣与上帝的属性与本质是完全相同的，随后成为三位一体论的基本信条。

Consubstantial (Latin: consubstantialis) is an adjective used in Latin Christian christology, coined by Tertullian in Against Hermogenes 44, used to translate the Greek term homoousios. "Consubstantial" describes the relationship among the Divine persons of the Christian Trinity and connotes that God the Father, God the Son, and God the Holy Ghost are "of one substance" in that the Son is "begotten" "before all ages" or "eternally" of the Father's own being, from which the Spirit also eternally "proceeds." In Latin languages it is the term for homoousism.