definitive

Etymology

From Middle French définitif.

adj

1. explicitly defined
2. conclusive or decisive
   definitive vote
   She will have the definitive say in the matter, after consulting her board of directors.
3. definite, authoritative and complete
4. limiting; determining
   a definitive word
5. (philately) general, not issued for commemorative purposes
6. (obsolete) Determined; resolved.

noun

1. (grammar) a word, such as a definite article or demonstrative pronoun, that defines or limits something
2. (philately) an ordinary postage stamp that is part of a series of all denominations or is reprinted as needed to meet demand