SUPPOSITION Synonyms: 70 Similar and Opposite Words

supposition

noun

ˌsə-pə-ˈzi-shən

Definition of supposition

as in hypothesis

an idea that is the starting point for making a case or conducting an investigation my supposition is that this grape variety, which flourishes in southern France, should do equally well here, given the similar climate

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

as in guess

an opinion or judgment based on little or no evidence it's pure supposition on your part that there's something illegal going on next door

Synonyms & Similar Words

as in assumption

something taken as being true or factual and used as a starting point for a course of action or reasoning worthless genetic research that was based on the erroneous supposition that acquired characteristics can be passed on to offspring

Synonyms & Similar Words

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 supposition What becomes alarmingly evident through the key assumptions check is how many of the current responses expect a quick resolution of the conflict — a supposition that is unsound, or at least unsupported. — Judd Devermont, semafor.com, 27 Apr. 2026 The supposition is the equivalent of green tea giant Bigelow taking Coca-Cola to court for its pour dominance in McDonald’s restaurants. — John Tamny, Forbes.com, 16 Apr. 2026 Zlotnikov wrote that the condition was likely caused by a mutation that had occurred very early in embryonic development, a supposition that was confirmed decades later by genetic analysis. — Jerome Groopman, New Yorker, 6 Apr. 2026 The past eight months have exposed both suppositions. — Liam Twomey, New York Times, 11 Mar. 2026 See All Example Sentences for supposition

Recent Examples of Synonyms for supposition

Noun

The elaborate decorations could support that hypothesis, officials said.

— Andrea Margolis, FOXNews.com, 24 Aug. 2026
Their hypothesis was confirmed when footage of a Ying Yang Twins performance went viral in 2025.

— Kailyn Brown, Los Angeles Times, 21 Aug. 2026

Definition of hypothesis

Noun

Markets will certainly try to anticipate Fed actions, based on economic data and our guess about how the Fed will respond to new data.

— Bill Conerly, Forbes.com, 28 Aug. 2026
Whether or not the man who lost his three children will continue to be abused online is anyone’s guess.

— Addie Morfoot, Variety, 28 Aug. 2026

Definition of guess

Noun

The alternative is to allow each side’s strategy to reinforce the other’s worst assumptions until escalation begins to look less like a choice than an inevitability.

— Hamidreza Azizi, Time, 29 Aug. 2026
Bareilles is mourning a few things — the deaths of close friends, dreams of easy fertility, assumptions of female autonomy, the American dream — but the music soars, more often than not.

— Chris Willman, Variety, 29 Aug. 2026

Definition of assumption

Noun

The lipstick index is an economic theory holding that sales of affordable discretionary spending or luxuries skyrocket when consumers believe an economic recession is impending.

— Sarah Glodek, Fortune, 28 Aug. 2026
Yet Turing’s theory of computation wasn’t really about computers, at least not at first.

— Ben Brubaker, Quanta Magazine, 28 Aug. 2026

Definition of theory

Noun

Shares of CrowdStrike jumped 10% after the company delivered another beat-and-raise quarter, cementing our thesis that cybersecurity has become one of the most critical investment priorities for companies in a post-Mythos world.

— Jeff Marks, CNBC, 27 Aug. 2026
Instead, the movie’s unexpected main attraction became indelible proof of its timelessly powerful thesis of acceptance.

— Alison Foreman, IndieWire, 26 Aug. 2026

Definition of thesis

Noun

The tax’s main sponsor, SEIU-United Healthworkers West, argued the proposition is clearly targeted at billionaires and no one else.

— Ben Paviour, Sacbee.com, 27 Aug. 2026
As a campaign finance watchdog two decades before the billionaire tax proposition, Wigglesworth warned Californians about what happened when wealthy donors flooded politics with cash.

— Mia Osmonbekov, Fortune, 27 Aug. 2026

Definition of proposition

Browse Nearby Words

supposing

supposition

suppositional

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“Supposition.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/supposition. Accessed 1 Sep. 2026.

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Synonyms of supposition

noun

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