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.
In one exchange, Nicholson challenged residents' assertion that the report said the welcome center would be located near a residential neighborhood, drawing a swift reaction from the crowd, according to a recording of the meeting. Alexandria Burris, IndyStar, 2 July 2025 In line with the Constitution's assertion that the transfer of power happens at exactly noon on Jan. 20, Trump will take the presidential oath during the swearing-in ceremony. Jordan Kellogg, The Enquirer, 2 July 2025 Even sophisticated test flows, complete with conditions and assertions, can be generated through natural language. Asad Khan, Forbes.com, 2 July 2025 When investors have near-unanimous alignment with management—including the assertion that diversity programs drive growth, innovation, and long-term value—executives and the board have the strongest possible mandate to cement DEI as a corporate imperative. Jim Edwards, Fortune, 1 July 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 10 Jul. 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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