The Collaborative International Dictionary
Consubstantiality \Con`sub*stan"ti*al"i*ty\ (?; 106), n. [Cf. F.
consubstantialit['e].]
Participation of the same nature; coexistence in the same
substance. ``His [the Son's] . . . consubstantiality with the
Father.''
--Hammend.
Wiktionary
n. The quality of being consubstantial.
Wikipedia
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.
Usage examples of "consubstantiality".
And therefore we can fittingly say that Christ was conceived of the Holy Ghost in such a way that the efficiency of the Holy Ghost be referred to the body assumed, and the consubstantiality to the Person assuming.