<p><strong>Adjective</strong></p><ul><li>most reliable or complete, as of a text, author, criticism, study, or the like: the definitive biography of Andrew Jackson.</li><li>serving to define, fix, or specify definitely: to clarify with a definitive statement.</li><li>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.</li><li>Synonyms: supreme, ultimate, absolute, complete.</li><li>Biology: providing the environment in which a fully developed parasite is able to reproduce, as is provided by a definitive host.</li></ul><p><strong>Noun</strong></p><ul><li>a defining or limiting word, as an article, a demonstrative, or the like.</li><li>Philately: a stamp that is a regular issue and is usually on sale for an extended period of time.</li></ul><p><strong>End of Response</strong></p>