ASSERTION Synonyms: 52 Similar and Opposite Words

assertion

noun

ə-ˈsər-shən

Definition of assertion

as in declaration

a solemn and often public declaration of the truth or existence of something the assertion that all men have certain unalienable rights is set forth in the Declaration of Independence

Synonyms & Similar Words

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Antonyms & Near Antonyms

as in argument

an idea or opinion that is put forth in a discussion or debate made the unlikely assertion that gravity affects light

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 assertion Consistent with our principles of objectivity and fair process, the referral neither adopts nor rejects the factual assertions in your letter and does not prejudge OPR's assessment. — Sarah N. Lynch, CBS News, 21 Oct. 2026 Spending time with him on two occasions validates Diplo’s assertion. — Ian Servantes, Footwear News, 20 Oct. 2026 The battle — which escalated into a federal lawsuit filed Thursday by the Justice Department against the state, Secretary of State Shirley Weber and Logan — features striking assertions of official misconduct. — Kevin Rector, Los Angeles Times, 17 Oct. 2026 Winkler responded by denying both parts of his wife’s assertion. — Wesley Stenzel, Entertainment Weekly, 15 Oct. 2026 See All Example Sentences for assertion

Recent Examples of Synonyms for assertion

Noun

The county is under an emergency declaration and residents in susceptible areas were told to evacuate Thursday afternoon.

— Ava Berger, NPR, 24 Oct. 2026
The boldest declarations of solidarity, Lee knows, often precede the quietest and cruellest of betrayals.

— Justin Chang, New Yorker, 23 Oct. 2026

Definition of declaration

Noun

The Brookings paper makes the same argument in academic terms.

— Nick Lichtenberg, Fortune, 24 Oct. 2026
Both local governments filed their briefs to the Supreme Court this week, emphasizing their arguments that the bans are lawful because the AR-15 and similar weapons are not ordinary firearms.

— Jack Birle, The Washington Examiner, 23 Oct. 2026

Definition of argument

Noun

The company reincorporated from Delaware to Texas in 2024, and its charter pushes shareholder claims into mandatory arbitration and limits derivative suits to investors holding at least 3% of the stock—a stake worth tens of billions of dollars.

— Heather Occhino, Fortune, 21 Oct. 2026
Under a contributory infringement claim, all authors need to prove is that Meta facilitated transfers of their works.

— Ashley Belanger, ArsTechnica, 20 Oct. 2026

Definition of claim

Noun

One matter of strong contention is Lee's opposition to the war in Gaza and her condemnation of the policies of Israeli Prime Minister Benjamin Netanyahu.

— Andy Sheehan, CBS News, 21 Oct. 2026
Those contentions — and Bartell’s claim of a second list of 17,000 potential noncitizen voters — only add to an already heated debate about the scope of the inquiry and its legitimacy.

— Kevin Rector, Los Angeles Times, 20 Oct. 2026

Definition of contention

Noun

After the wisdom of America's most popular sport was questioned over its insistence to play its first-ever game in France in the wake of a Saturday filled with protests and violence, the NFL kicked off inside Paris's Stade de France on Sunday.

— Armando Salguero OutKick, FOXNews.com, 25 Oct. 2026
This takes more chutzpah than Ohtani’s insistence to continue as a two-way player.

— Los Angeles Times, Los Angeles Times, 24 Oct. 2026

Definition of insistence

Noun

Consistent with their hypothesis, the secretion signal helps transfer the enzyme out of the cell, while the lipid anchor holds it near the cell surface.

— Muskan Bhatia, Interesting Engineering, 21 Oct. 2026
But there are indirect consequences of the Many Worlds hypothesis that could lend the idea credibility.

— Philipp Strasberg, Scientific American, 20 Oct. 2026

Definition of hypothesis

Noun

Under his leadership, Israel’s prison service has drawn allegations of abuse for its treatment of Palestinian detainees.

— Eric Cortellessa, Time, 22 Oct. 2026
The allegations were initally investigated as an ethics violation but evolved into a criminal matter.

— Cristóbal Reyes, The Orlando Sentinel, 22 Oct. 2026

Definition of allegation

Browse Nearby Words

asserting

assertion

assertions

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Style

“Assertion.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/assertion. Accessed 27 Oct. 2026.

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Synonyms of assertion

noun

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