A version is one specific form or the work–the one the author intended at some particular moment in time. A version has no substantial existence, but it is represented more or less will or completely by a single text as found in a manuscript, proof, book, or some other written or printed form. In other words, a version is the ideal form of a work as it was intended at a single moment or period for the author. The temporal limits included in this definition acknowledge the fluctuating intentions attending creative acts.
(Shillingsburg 1996, 44)