as in hypothesis
an idea that is the starting point for making a case or conducting an investigation set out to prove her theory that people can't really taste any difference between colas, so they buy according to the product's image

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How does the noun theory differ from other similar words?

The words hypothesis and law are common synonyms of theory. While all three words mean "a formula derived by inference from scientific data that explains a principle operating in nature," theory implies a greater range of evidence and greater likelihood of truth.

the theory of evolution

When would hypothesis be a good substitute for theory?

Although the words hypothesis and theory have much in common, hypothesis implies insufficient evidence to provide more than a tentative explanation.

a hypothesis explaining the extinction of the dinosaurs

When might law be a better fit than theory?

The meanings of law and theory largely overlap; however, 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

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 theory An autonomous system equaling the best human fleets signals that automation is moving from theory to reality. Kurt Knutsson, FOXNews.com, 29 Oct. 2025 This means that the authors only need to prevail on one of their theories. Winston Cho, HollywoodReporter, 29 Oct. 2025 If Questlove’s theory is right that an album truly starts with its third song, this is a curious choice for the foundation of Rumours. Alan Light, Rolling Stone, 29 Oct. 2025 Though the origin of transients is unknown, scientists have proposed several theories. Chris Young, Interesting Engineering, 28 Oct. 2025 See All Example Sentences for theory
Recent Examples of Synonyms for theory
Noun
  • Capturing a moment under specific conditions can help validate a hypothesis or guide mission changes.
    Suzanne Wright, USA Today, 29 Oct. 2025
  • And so, in principle, there is always an alternative hypothesis that could explain the data.
    Big Think, Big Think, 29 Oct. 2025
Noun
  • Based on Boss’ checks, the TJX thesis is still alive and well.
    Jeff Marks, CNBC, 27 Oct. 2025
  • That’s the thesis of Returning to Myself, Carlile’s eighth solo album.
    Jonathan Bernstein, Rolling Stone, 24 Oct. 2025

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Cite this Entry

“Theory.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/theory. Accessed 31 Oct. 2025.

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