definitive: Meaning and Definition of

de•fin•i•tive

1. most reliable or complete, as of a text, author, criticism, study, or the like: the definitive biography of Andrew Jackson.
2. serving to define, fix, or specify definitely: to clarify with a definitive statement.
3. having its fixed and final form; providing a solution or final answer; satisfying all criteria: the definitive treatment for an infection; a definitive answer to a dilemma.
4. fully developed or formed; complete.

1. a defining or limiting word, as an article, a demonstrative, or the like.
2. a stamp that is a regular issue and is usually on sale for an extended period of time. Cf. commemorative (def. 2).