What does "Tres Personae" mean in Tertullian's "Una Substantia Tres Personae"?

I've read the internet about Tertullian's "tres personae, una substantia" of Trinity. It seems that his "tres personae, una substantia" is rejected by all kind of Christianity. However I would like to know what the Tertullian's "Tres Personae" mean since from the internet I read about English, the word [Person] has different meaning with [Persona]. Now it seems to me the "Tres Personae" is [Three Persona], not [Three Persons], while in the point of view of the pro-Trinity majority (as far as I know) it's about [Three Persons]. So, my question is – did Tertullian meant of his "Personae" a Person? or a Persona? Or did I make mistake which actually in English language, there is no difference between Persona and Person?