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1. Serving to define or identify as distinct from others: "The Enlightenment pushed this project further trying to make science and its hallmark method definitive of the rational life" (Peter Machamer).
2. Supplying or being a final settlement or decision; conclusive: "The fall of the city Constantine had founded marked the definitive end of the Christian Eastern Empire" (James Carroll). See Synonyms at decisive.
3. Authoritative and complete: a definitive biography. See Usage Note at definite.
4. Mass produced in indefinite quantities over an indefinite period of time. Used of postage stamps.
5. Biology Fully formed or developed, as an organ or structure.
1. Grammar A word that defines or limits, such as the definite article or a demonstrative pronoun.
2. A definitive postage stamp.

de·fin′i·tive·ly adv.
de·fin′i·tive·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
Music, when combined with a pleasurable idea, is poetry; music, without the idea, is simply music; the idea, wi thout the music, is prose, from its very definitiveness.
At length I would be avenged; this was a point definitely settled--but the very definitiveness with which it was resolved, precluded the idea of risk.
Unlike many chronological accounts of musical, aesthetic, or cultural change, this article makes no claims to definitiveness or even linear integrity.
Definitiveness clearly makes a big difference for what we can reasonably claim.
He pointed out that celibacy has nothing to do with simply <<avoiding marriage>> which can be <<based on a will to live only for oneself, of not accepting any definitive tie, to have the life of every moment in full autonomy, to decide at any time what to do, what to take from life; and therefore a "no" to the bond, a "no" to definitiveness, to have life for oneself alone>>.
He also listed the characteristic of a good plan to include realistic and capable of implementation, have clearly defined objectives in terms of scope, accuracy, clarity, and definitiveness, where possible targets must be set either in qualitative and quantitative form, must be comprehensive, flexible and have economic effectiveness.
Dominik's film thoroughly reworks a number of Western tropes, and it is far from celebrating "the phallic image of a man on horseback, sitting high above the ground, upright and superior, gazing down at the world whose gaze it in turn solicits" (Mitchell 167), but it confirms the paradoxical logic of the genre as described by Mitchell--and does so with utmost definitiveness. Its depiction of vulnerable masculinity does not foreground moments of physical weakness, but a lasting psychological impasse.
Gothic literature does not shield the reader from the abruptness, definitiveness, and violence that can categorize death (Punter).
While it seems likely that back pain would be similarly associated with depression in the emerging adult population, the definitiveness of this conclusion is limited by the small number of research studies in this area.
Trump also attacked the media, former President Barack Obama and the Democratic National Convention (DNC), seeming to reverse his opinion on the definitiveness of Russia's involvement.
Moreover, despite the ambiguity of the line, the abruptness and definitiveness of "It ended," like the allusion to "the task," suggests that its referents are givens.