The Constitution does not define the term.
You can't bootstrap blood from a stone.
Fundamentally, the **only** thing that makes the Constitution work is the **honest** good will of the citizens. No number of constitutions, laws, or definitions will corral evil. Evil will leak through every time.
So!....If citizens choose to ignore the original intent of the Founders of our nation, don't be surprised when evil comes jack booting its way through your door.