1
as in authoritative
being the most accurate and apparently thorough the definitive work on the attack on Pearl Harbor

Synonyms & Similar Words

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Synonym Chooser

How is the word definitive different from other adjectives like it?

Some common synonyms of definitive are conclusive, decisive, and determinative. While all these words mean "bringing to an end," definitive applies to what is put forth as final and permanent.

the definitive biography

When is it sensible to use conclusive instead of definitive?

In some situations, the words conclusive and definitive are roughly equivalent. However, conclusive applies to reasoning or logical proof that puts an end to debate or questioning.

conclusive evidence

When is decisive a more appropriate choice than definitive?

The synonyms decisive and definitive are sometimes interchangeable, but decisive may apply to something that ends a controversy, a contest, or any uncertainty.

a decisive battle

When can determinative be used instead of definitive?

The meanings of determinative and definitive largely overlap; however, determinative adds an implication of giving a fixed character or direction.

the determinative factor in the court's decision

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of definitive Since then, hundreds of astronomers have monitored OJ287 to test the theory and to seek definitive proof that the two black holes truly share the same galactic heart, according to the statement. Sharmila Kuthunur, Space.com, 10 Oct. 2025 Van Ginkel’s neck injury has a less definitive recovery timeline. Alec Lewis, New York Times, 10 Oct. 2025 Jon Batiste is the definitive musical Renaissance man. Melissa Ruggieri, USA Today, 10 Oct. 2025 The debilitating long-term illness affects millions worldwide, including more than 400,000 people in the UK, but has long lacked a definitive diagnostic tool. Neetika Walter, Interesting Engineering, 9 Oct. 2025 See All Example Sentences for definitive
Recent Examples of Synonyms for definitive
Adjective
  • While Efraimoglou is bold and authoritative, Vandorou is quiet and reflective.
    Janine Di Giovanni, Travel + Leisure, 11 Oct. 2025
  • The Red List, produced by the International Union for Conservation of Nature (IUCN), is the most authoritative global assessment of extinction risk of species.
    Nell Lewis, CNN Money, 10 Oct. 2025
Adjective
  • The initial analysis, concluded on August 8, 2025, confirmed the skull was that of an adult, but could not provide further conclusive information.
    Katie Wiseman, IndyStar, 17 Oct. 2025
  • That means kimchi's beneficial bacteria could potentially offset the hypertensive effects of sodium, although the research is not conclusive.
    Andrea Margolis, FOXNews.com, 8 Oct. 2025
Adjective
  • This represents a more explicit approach than the February policy change, which allowed erotica in certain contexts but lacked age-gating infrastructure.
    ArsTechnica, ArsTechnica, 15 Oct. 2025
  • While a reference to Democrats alone likely doesn't constitute a violation of the law, the explicit blaming of their party for the shutdown may, said Michael Fallings, a partner at Tully Rinckey, an employment law firm.
    NPR, NPR, 15 Oct. 2025
Adjective
  • And don’t forget to book a table at the bijou Il Piccolo restaurant, comprising just nine tables to offer—in the spirit of Violino d’Oro more broadly—subtle, meticulously executed riffs on classic Venetian fare and the flavors of the lagoon.
    Liam Hess, Vogue, 13 Oct. 2025
  • From classic stud earrings to trendy chunky rings, here are the best jewelry gifts to shop this season.
    Jessie Quinn, StyleCaster, 13 Oct. 2025
Adjective
  • But if the series pushes to a decisive seventh game, a World Series appearance on the line, Bieber will get the ball once more.
    Mitch Bannon, New York Times, 16 Oct. 2025
  • Justice Brett Kavanaugh, who cast the decisive fifth vote in a similar case from Alabama two years ago, reiterated his view that there should be an end point to racial remedies like this one.
    Nina Totenberg, NPR, 15 Oct. 2025
Adjective
  • Gaining more plants is a definite bonus.
    Karen Brewer Grossman, Southern Living, 15 Oct. 2025
  • Riley did not have definite updates on Sanders’ and Jordan’s health after the game.
    Haley Sawyer, Oc Register, 12 Oct. 2025
Adjective
  • Charlap plays hem all with exemplary taste.
    George Varga, San Diego Union-Tribune, 9 Oct. 2025
  • As far as gender-bent reboots go, High Fidelity is exemplary.
    Abby Monteil, Them., 3 Oct. 2025
Adjective
  • To be clear, the defense isn’t without concerns.
    Kansas City Star, Kansas City Star, 13 Oct. 2025
  • By virtue of its lack of carbs, clear protein doesn’t contain any lactose—a sugar found in dairy that can cause digestive irritation in some people, like bloating and diarrhea.
    Caroline Tien, SELF, 13 Oct. 2025

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Cite this Entry

“Definitive.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/definitive. Accessed 19 Oct. 2025.

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