Definitive /(?)/

De·fin·i·tive

Definitive

a.
  1. Determinate; positive; final; conclusive; unconditional; express.
    A strict and definitive truth.
    Some definitive . . . scheme of reconciliation.
  2. Limiting; determining; as, a definitive word.
  3. Determined; resolved. [Obs.]

Definitive

n.
  1. A word used to define or limit the extent of the signification of a common noun, such as the definite article, and some pronouns. (Gram.)