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definitive

[ dih-fin-i-tiv ]
/ dɪˈfɪn ɪ tɪv /
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adjective
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. providing the environment in which a fully developed parasite is able to reproduce, as is provided by a definitive host.
noun
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).
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Origin of definitive

First recorded in 1350–1400; Middle English, from Old French, from Latin dēfīnītīvus, equivalent to dēfīnīt(us) (see definite) + -īvus adjective suffix (see -ive)

OTHER WORDS FROM definitive

WORDS THAT MAY BE CONFUSED WITH definitive

definite, definitive
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use definitive in a sentence

British Dictionary definitions for definitive

definitive
/ (dɪˈfɪnɪtɪv) /

adjective
serving to decide or settle finally; conclusive
most reliable, complete, or authoritativethe definitive reading of a text
serving to define or outline
zoology fully developed; completethe definitive form of a parasite
  1. (of postage stamps) permanently on sale
  2. (as noun) a definitive postage stamp
noun
grammar a word indicating specificity of reference, such as the definite article or a demonstrative adjective or pronoun

Derived forms of definitive

definitively, adverbdefinitiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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