Was the term “natural born citizen” defined in the Constitution?
Well in a fashion they did, because the other citizen classes were defined and this one wasn't. That tells you it is not like the others because they specifically called it different and applied it to only one office. Logic should tell you it was special but I guess that would depend on your agenda.
Natural Born Citizen does not mean a citizen not naturalized or the Founders being more than marginally literate probably would have been able to find a way to say they were the same thing.
Thanks for playing but I said I was through with this rabbit hole until after the first two state primaries, by then I doubt it will matter, if it still matters then prepare to defend against the democrats and probably a few corrupt judges.