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