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Definition of hypothesisnext
as in theory
an idea that is the starting point for making a case or conducting an investigation working on the hypothesis that teenagers function better in the late morning, some high schools are starting classes later

Synonyms & Similar Words

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Antonyms & Near Antonyms

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How does the noun hypothesis differ from other similar words?

The words law and theory are common synonyms of hypothesis. While all three words mean "a formula derived by inference from scientific data that explains a principle operating in nature," hypothesis implies insufficient evidence to provide more than a tentative explanation.

a hypothesis explaining the extinction of the dinosaurs

When can law be used instead of hypothesis?

The synonyms law and hypothesis are sometimes interchangeable, but law implies a statement of order and relation in nature that has been found to be invariable under the same conditions.

the law of gravitation

In what contexts can theory take the place of hypothesis?

The words theory and hypothesis can be used in similar contexts, but theory implies a greater range of evidence and greater likelihood of truth.

the theory of evolution

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 hypothesis Those findings, published in 2020, contradicted the earlier hypothesis and raised doubts as to whether the species should be considered a hominin at all. Cody Cottier, Scientific American, 2 Jan. 2026 The last hypothesis was not far from the mark, according to researchers who have revealed a scientific explanation. Katie Hunt, CNN Money, 29 Dec. 2025 The hosts embark on a monomaniacal investigation, armed with an impressive amount of evidence to support their hypothesis that there’s a greater purpose to Adams’s penchant for the bathtub. Benjamin Cannon, The Atlantic, 23 Dec. 2025 The other hypothesis rests on some vaccines’ ability to offer broader health benefits — benefits that come not from targeting the virus, but from triggering the immune system to be on the hunt for bad actors. Lisa Jarvis, Twin Cities, 20 Dec. 2025 See All Example Sentences for hypothesis
Recent Examples of Synonyms for hypothesis
Noun
  • Those are, indeed, pat, credible theories and predictions.
    Théoden Janes, Charlotte Observer, 8 Jan. 2026
  • But now, in the planet’s capital city of Apperax, a murder is committed with no suspects, forensics or theories.
    Aaron Couch, HollywoodReporter, 8 Jan. 2026
Noun
  • His eyes lit up, as if asked to present a thesis sitting in his top drawer.
    Ira Winderman, Sun Sentinel, 13 Jan. 2026
  • The Skydance thesis, according to a person who worked closely with David, was that Hollywood wasn’t prepared for the overwhelming economic force of a Silicon Valley billionaire throwing around his wealth and ambition.
    Reeves Wiedeman, Vulture, 12 Jan. 2026
Noun
  • So the complete value proposition of society is different on the island.
    Dalton Ross, Entertainment Weekly, 7 Jan. 2026
  • For families Atlantis’s central proposition is family fun, and a stay at The Cove will position a family to make the most of it.
    Jesse Ashlock, Condé Nast Traveler, 7 Jan. 2026

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Cite this Entry

“Hypothesis.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/hypothesis. Accessed 20 Jan. 2026.

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