assertion
noun
as·ser·tion
ə-ˈsər-shən 
a-
: the act of asserting or something that is asserted: such as
a
: insistent and positive affirming, maintaining, or defending (as of a right or attribute)
an assertion of ownership/innocence
b
: a declaration that something is the case
He presented no evidence to support his assertions.
Examples of assertion in a Sentence
the assertion that all men have certain unalienable rights is set forth in the Declaration of Independence
made the unlikely assertion that gravity affects light
Recent Examples on the Web
The State Department rejected the assertion that last year’s reductions in force (RIFs) impacted their assistance to US citizens stranded in the Middle East or to State’s consular operations.
—
Cnn.com Wire Service, Mercury News, 11 Mar. 2026
That assertion was confirmed in a trove of emails from city officials reviewed this week by The Dallas Morning News.
—Mark Lamster
architecture Critic, Dallas Morning News, 11 Mar. 2026
In Arizona, the FBI relied on subpoenas, a law enforcement maneuver that does not require judicial sign-off or prosecutors’ assertion that there’s probable cause of a crime.
—Josh Kelety, Los Angeles Times, 10 Mar. 2026
The allegations included assertions that votes had been counted more than once and that large numbers of votes had been cast by deceased people.
—Sarah Fitzpatrick, The Atlantic, 10 Mar. 2026
See All Example Sentences for assertion
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Cnn.com Wire Service, Mercury News, 11 Mar. 2026
That assertion was confirmed in a trove of emails from city officials reviewed this week by The Dallas Morning News.
—Mark Lamster
architecture Critic, Dallas Morning News, 11 Mar. 2026
In Arizona, the FBI relied on subpoenas, a law enforcement maneuver that does not require judicial sign-off or prosecutors’ assertion that there’s probable cause of a crime.
—Josh Kelety, Los Angeles Times, 10 Mar. 2026
The allegations included assertions that votes had been counted more than once and that large numbers of votes had been cast by deceased people.
—Sarah Fitzpatrick, The Atlantic, 10 Mar. 2026
See All Example Sentences for assertion
Cite this Entry
“Assertion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/assertion. Accessed 14 Mar. 2026.
Copy CitationKids Definition
assertion
noun
as·ser·tion
ə-ˈsər-shən
a-
: the act of asserting
also
: something asserted : declaration
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