definitive

a. [ L. definitivus: cf. F. définitif. ] 1. Determinate; positive; final; conclusive; unconditional; express. [ 1913 Webster ]

A strict and definitive truth. Sir T. Browne. [ 1913 Webster ]

Some definitive . . . scheme of reconciliation. Prescott. [ 1913 Webster ]

2. Limiting; determining; as, a definitive word. [ 1913 Webster ]

3. Determined; resolved. [ Obs. ] Shak. [ 1913 Webster ]

n. (Gram.) A word used to define or limit the extent of the signification of a common noun, such as the definite article, and some pronouns. [ 1913 Webster ]

☞ Definitives . . . are commonly called by grammarians articles. . . . They are of two kinds, either those properly and strictly so called, or else pronominal articles, such as this, that, any, other, some, all, no, none, etc. Harris (Hermes). [ 1913 Webster ]

adv. In a definitive manner. [ 1913 Webster ]