Federal Visionists love to boast about being "Biblicists," claiming that we should to use Bible words in the way the Bible uses them. Not only are claims like this hopelessly naive, they are downright dangerous.
Once a technical definition has been established by the Reformed faith, we must insist that such a definition be the only way that a particular word is ever used, regardless of what the Bible or anyone else says. If we insist that the Biblical usage of words is primary, then we run the risk of contradicting the Reformed faith. This is the road to Rome, Constantinople, Canterbury, and Moscow (not the one in Russia).