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
Mamdani swung back at Musk’s assertion on Saturday, coming to Bonsignore’s defense.
—
Molly Parks, The Washington Examiner, 28 Dec. 2025
The Department of Homeland Security did not answer CNN requests for comment on Fleming’s assertion the arrests are designed to intimidate migrants into self-deporting.
—Whitney Wild, CNN Money, 26 Dec. 2025
The film received criticism for some of its scientific assertions, but experts agree that its central point about the dangers of overfishing is valid and essential to improving the health of both our oceans and the creatures that live there.
—Tomris Laffly, Entertainment Weekly, 25 Dec. 2025
Paramount took a swipe at that assertion on Monday — maintaining that Larry Ellison holds the majority of the trust’s assets and that Warner had not previously asked for a personal guarantee.
—Boston Herald Staff, Boston Herald, 22 Dec. 2025
See All Example Sentences for assertion
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Molly Parks, The Washington Examiner, 28 Dec. 2025
The Department of Homeland Security did not answer CNN requests for comment on Fleming’s assertion the arrests are designed to intimidate migrants into self-deporting.
—Whitney Wild, CNN Money, 26 Dec. 2025
The film received criticism for some of its scientific assertions, but experts agree that its central point about the dangers of overfishing is valid and essential to improving the health of both our oceans and the creatures that live there.
—Tomris Laffly, Entertainment Weekly, 25 Dec. 2025
Paramount took a swipe at that assertion on Monday — maintaining that Larry Ellison holds the majority of the trust’s assets and that Warner had not previously asked for a personal guarantee.
—Boston Herald Staff, Boston Herald, 22 Dec. 2025
See All Example Sentences for assertion
Cite this Entry
“Assertion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/assertion. Accessed 31 Dec. 2025.
Copy CitationKids Definition
assertion
noun
as·ser·tion
ə-ˈsər-shən
a-
: the act of asserting
also
: something asserted : declaration
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