most reliable or complete, as of a text, author, criticism, study, or the like:
the definitive biography of Andrew Jackson.
serving to define, fix, or specify definitely:
to clarify with a definitive statement.
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.
Biology. fully developed or formed; complete.
a defining or limiting word, as an article, a demonstrative, or the like.
Philately. a stamp that is a regular issue and is usually on sale for an extended period of time.
Compare commemorative (def 2).
Historical Examples

Aletta Bertram Mitford
The Moonshiners At Hoho-Hebee Falls Charles Egbert Craddock (AKA Mary Noailles Murfree)

serving to decide or settle finally; conclusive
most reliable, complete, or authoritative: the definitive reading of a text
serving to define or outline
(zoology) fully developed; complete: the definitive form of a parasite

(of postage stamps) permanently on sale
(as noun) a definitive postage stamp

(grammar) a word indicating specificity of reference, such as the definite article or a demonstrative adjective or pronoun


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