Of course you realize that I do not base my beliefs upon "orthodox definitions" but rather upon the Word of God. If I did, however, lean to secular definitions of biblical words, I would certainly choose the definition that best fit the context of Scripture.
Why would we consider any other definition except the biblical one given in #3? Especially when you consider that the Greek word pneuma is translated many times "spirit" or "ghost" but never"breathe."
So, we can rightly say that "all Scripture" is given by pneuma the Holy Spirit. That is the doctrine of preservation and the doctrine of inspiration combined together to give us an inspired, preserved copy of the Word of God today. The Holy Spirit never stopped working after the originals were completed.
Theological definitions tend to be drawn from conclusions that are made from Scripture. For example, we do not have any definition of trinity, but we draw from the Scripture that we know about the trinity to form a definition.
However we do have the word "inspiration" in the Bible. From it we can gain the exact denotative meaning: "God-breathed." But the doctrine of inspiration encompasses much more. Entire books have been written on the doctrine of inspiration. What is inspiration then? The best place to start is in the Scriptures themselves:
2 Peter 1:21 For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
--First note that it is "holy men" referred to here. These holy men specifically refer to the OT prophets that wrote down the words of Scripture that are found in the OT canon. I believe that Peter, by extension, would be including the words of the apostles. What it does not refer to and never will refer to is the words of KJV translators, or any other translator or copyist. It refers directly to the writers of Scripture. What they wrote down was inspired (God-breathed). These were the men that "moved by the Holy Spirit" to pen the words of God. If you include any others than we have an open canon and anyone (like the Mormons) can continue to add to our Bible.
2 Timothy 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
--This is the verse where "inspiration" is actually used. As has already been noted it means "God-breathed." Anything written by God, breathed out by God, is perfect. We know that the KJV has literally scores of mistakes in it, as posted elsewhere. There are differences just between the Oxford and Cambridge editions of todays KJV. Obviously it isn't error free. Only the originals are error free. Meaning is lost in any translation, as it is in the KJV. If you ever work with languages this will be very apparent to you. There are many things that cannot be translated accurately, and some things that are actually untranslatable; that is they do not have an English equivalent in the language from which they are being translated. Don't think that the KJV has escaped from these problems in translation.
Thus only the originals are perfect, breathed out by God, infallible, without any mistake whatsoever. It is that way, because they alone are produced by God.