I define "natural" in the only manner that it is possible for a rational human being to define it.
"Not requiring the intervention of man."
Words mean things.
I would tell you to look up the etymology of words such as "Nature, Native, Natal, National, Natural, etc but given what I perceive to be your level of intellect, I don't think you would know how.
Suffice it to say you can learn a lot about the correct meaning of a word by exploring from whence it came.
Not in the way you mean, from what I can tell. You define "natural" as "not requiring the intervention of man". How does that relate to determining natural-born citizen? Man has to define it otherwise your definition is so broad as to be useless. "Not requiring the intervention of man citizenship"?
You can blabber on all you want. You can claim that natural-born citizens are only people born in the country of citizen parents. But you cannot point to a clear, single, universally accepted definition of natural-born citizen that agrees with you. And since you can't then it is up to Congress to define it by determining, as part of their Constitutional power to set uniform rules of naturalization, who doesn't need to be naturalized. You don't want Congress to do that? Fine, then who defines it and where?