Can I use the phrase "definitive edition" to explain that a product has the most up-to-date and highest quality in the field as opposite to mean "last edition of the same series"?
Thank you for your help.
In Merriam-Webster's Eleventh Collegiate Dictionary (2003), the closest definition of definitive to the one you seem to have in mind is this one:
2 : authoritative and apparently exhaustive (a definitive edition}
But there is something less than definitive about this definition, starting with the weasel word "apparently" in the main definition and exacerbated by the indefinite article preceding "definitive edition" in the example.
In one sense, every marketed version of an operating system (for example) is definitive at the time it is released, in that it is both "authoritative" at the time of its release and "apparently exhaustive"—as far as anyone can tell. But in another sense, the only definitive edition of an operating system is the last one released before it is superseded by an entirely different operating system (as opposed to being replaced by yet another upgrade of the old OS).
Consciousness of this reality has, I think, made consumers rather cynical about claims that something is "a definitive edition of X." Sure it is—for now. But consumers' suspicion that "definitive edition" has become little more than a marketing phrase doesn't mean that the phrase isn't technically accurate as a description of the latest version of a released product. After all, "definitive edition" doesn't promise that the version of the product so designated will be (as you say) the "last edition" in its series; it merely announces that the product is the authoritative and apparently exhaustive version for the moment.