Source : Webster's Revised Unabridged Dictionary (1913)

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.