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 Of course, this is all a supposition and one that will only happen at some point in the future. — Lizzie Lanuza, StyleCaster, 3 Aug. 2026 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 See All Example Sentences for supposition

Recent Examples of Synonyms for supposition

Noun

Fusion equations meet robotics In nuclear fusion research, Google worked with University of Maryland professor Matt Landreman to identify a broader class of counterexamples to Grad’s conjecture, a mathematical hypothesis dating to 1967.

— Neetika Walter, Interesting Engineering, 13 Oct. 2026
That hypothesis stems from earlier research by Geoff Cook, the CEO of Noom, a digital health company that is funding the Wharton study.

— Mary Cunningham, CBS News, 8 Oct. 2026

Definition of hypothesis

Noun

Given Abbey’s anxieties about spending money and fear of not having enough, Stacy plans to use very conservative assumptions for inflation, health costs and average returns when making her projections based on Abbey’s savings today.

— Jeanne Sahadi, CNN Money, 17 Oct. 2026
But researchers involved in the study challenged that assumption.

— Maria Mocerino, Interesting Engineering, 17 Oct. 2026

Definition of assumption

Noun

Framing theory explains how the presentation of information in the media influences the way people process and interpret it.

— Heather LaMarre, The Conversation, 14 Oct. 2026
His theory didn’t reach far beyond Japan until the translation of his original essay, first in 1978, then in 2005, and again, with Mori’s approval, in 2012.

— Daniel Hernandez, Los Angeles Times, 14 Oct. 2026

Definition of theory

Noun

On its surface, the conjecture concerns the behavior of a particular function.

— Quanta Magazine, Quanta Magazine, 19 Oct. 2026
After Jones shined during his first start, the Gators’ quarterback decision will be scrutinized and dissected, fueling two weeks of endless conjecture leading up to the Georgia game.

— Edgar Thompson, The Orlando Sentinel, 18 Oct. 2026

Definition of conjecture

Noun

This thesis was already borne out earlier this year, when a wave of AI enthusiasts bought Mac Minis in order to set up personal AI agents through the open-source project OpenClaw.

— Andrew R. Chow, Time, 15 Oct. 2026
Those priorities should connect directly to the investment thesis.

— James Fratzke, Forbes.com, 13 Oct. 2026

Definition of thesis

Noun

The Met residency reverses that proposition, allowing the precision and discipline of watchmaking to inform objects far removed from the wrist.

— Thomas Waller, Footwear News, 13 Oct. 2026
The task force gave presentations to every department to involve the staff of 2,000 in the logic of Weiss’s proposition.

— Hilarie M. Sheets, ARTnews.com, 13 Oct. 2026

Definition of proposition

Browse Nearby Words

supposing

supposition

suppositional

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Cite this Entry

Style

“Supposition.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/supposition. Accessed 20 Oct. 2026.

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Synonyms of supposition

noun

Example Sentences

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