Definition of theorynext
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

Synonyms & Similar Words

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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 Under one plausible theory of technological development, artificial intelligence will turn the economy into a dystopian split screen. Rogé Karma, The Atlantic, 2 July 2026 The roles created are not generating value at the rate the theory predicted. Vibhas Ratanjee, Forbes.com, 2 July 2026 Now, a wave of new theories offers tantalizing solutions — but which ones portray reality is an open question. Quanta Magazine, 2 July 2026 That clearly was not the case, even though, of course, several of the opinions tilted in favor of the strong unitary executive theory. John E. Jones Iii, The Conversation, 1 July 2026 See All Example Sentences for theory
Recent Examples of Synonyms for theory
Noun
  • The interest rate hypothesis points the wrong direction — the most rate-sensitive occupations, like construction, have the lowest AI exposure.
    Nick Lichtenberg, Fortune, 27 June 2026
  • Science is designed to estimate risk, test hypotheses, identify patterns, and reduce the likelihood of false causal inference.
    Alex Smolak, STAT, 27 June 2026
Noun
  • GameStop's takeover pursuit adds a headline catalyst, but the more durable thesis is that eBay's own operating momentum is improving.
    Tony Zhang, CNBC, 1 July 2026
  • The thesis rests on a claim that would have sounded absurd a year ago.
    Boaz Sobrado, Forbes.com, 1 July 2026

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Cite this Entry

“Theory.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/theory. Accessed 5 Jul. 2026.

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