== History of term == Since the Latin language lacks a present active participle for the verb `to be,` Tertullian and other Latin authors rendered the Greek noun `ousia` (being) as `substantia,` and the Greek adjective `homoousios` (of the same being) as `consubstantialis`. Unlike the Greek words, which are etymologically related to the ...
• (n.) Participation of the same nature; coexistence in the same substance.
Con`sub·stan'ti·al'i·ty noun [ Confer French consubstantialité .] Participation of the same nature; coexistence in the same substance. 'His [ the Son's] . . . consubstantiality with the Father.' Hammend. 
Substance commonality.