assertion

noun

as·​ser·​tion ə-ˈsər-shən How to pronounce assertion (audio)
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
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.
There’s been a misguided assertion that what’s happening with ICE is only a Latino issue, but ICE’s bombardment of both Black and Brown communities in Chicago demonstrates otherwise. Andre Gee, Rolling Stone, 21 Oct. 2025 The Kinahans soon tested the strength of that assertion. Ed Caesar, New Yorker, 20 Oct. 2025 Scientists, meteorologists, and other branches of the federal government say these assertions are largely incorrect. Stephanie Armour, CNN Money, 16 Oct. 2025 The administration has not made public any evidence to support those assertions. Luis Martinez, ABC News, 16 Oct. 2025 See All Example Sentences for assertion

Word History

Etymology

see assert

First Known Use

15th century, in the meaning defined above

Time Traveler
The first known use of assertion was in the 15th century

Browse Nearby Words

Cite this Entry

“Assertion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/assertion. Accessed 22 Oct. 2025.

Kids Definition

assertion

noun
as·​ser·​tion ə-ˈsər-shən How to pronounce assertion (audio)
a-
: the act of asserting
also : something asserted : declaration

More from Merriam-Webster on assertion

Last Updated: - Updated example sentences
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