DEFINITIVE

definitive, determinate

(adjective) supplying or being a final or conclusive settlement; “a definitive verdict”; “a determinate answer to the problem”

definitive, unequivocal

(adjective) clearly defined or formulated; “the plain and unequivocal language of the laws”- R.B.Taney

authoritative, definitive

(adjective) of recognized authority or excellence; “the definitive work on Greece”

Source: WordNet® 3.1

Etymology

Adjective

definitive (comparative more definitive, superlative most definitive)

explicitly defined

conclusive or decisive

definite, authoritative and complete

limiting; determining

(philately) general, not issued for commemorative purposes

(obsolete) Determined; resolved.

Noun

definitive (plural definitives)

(grammar) a word, such as a definite article or demonstrative pronoun, that defines or limits something

(philately) an ordinary postage stamp that is part of a series of all denominations or is reprinted as needed to meet demand

Synonym: definitive stamp

Source: Wiktionary

De*fin"i*tive, a. Etym: [L. definitivus: cf. F. définitif.]

1. Determinate; positive; final; conclusive; unconditional; express. A strict and definitive truth. Sir T. Browne. Some definitive . . . scheme of reconciliation. Prescott.

2. Limiting; determining; as, a definitive word.

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

De*fin"i*tive, n. (Gram.)

Definition: A word used to define or limit the extent of the signification of a common noun, such as the definite article, and some pronouns.

Note: 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).

Source: Webster’s Unabridged Dictionary 1913 Edition