as·​ser·​tion | \ ə-ˈsər-shən How to pronounce assertion (audio) , a- \

Definition of assertion

: 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 However, the actual source of the leak is unknown at this point and McConnell did not offer any evidence for his assertion. Morgan Watkins, The Courier-Journal, 3 May 2022 The 6,700 people here representing the world’s companies and law firms cannot be wrong in their assertion that brand names play a crucial role in marketing products; as such, the brand names need to be protected. Jess Collen, Forbes, 3 May 2022 The book stands or falls on its assertion of a radical discontinuity between the antebellum and postbellum United States, but the author himself gives us evidence of continuity. Barton Swaim, WSJ, 25 Mar. 2022 For Europeans, an assertion that Ukraine is part of the continent’s family of nations. Laura King, Los Angeles Times, 16 Mar. 2022 That is devastating news for Bannon, whose criminal prosecution for an even more outrageous blanket assertion of the privilege has already begun. Norman Eisen, CNN, 20 Jan. 2022 The file contains the supporting documentation for every factual assertion in a court application, as well as the result of government database searches and information about informants used in the case. Arkansas Online, 1 Oct. 2021 In the next month, the FTC will get a second chance to provide evidence for its market-share assertion. Daniel Tenreiro, National Review, 29 June 2021 Cannon also told Fortune that the move by Panama would undermine the U.K. government’s assertion that cryptocurrencies are not official currencies, and could therefore undermine the British law that says any gains made on crypto are liable to tax. Chloe Taylor, Fortune, 29 Apr. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'assertion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of assertion

15th century, in the meaning defined above

History and Etymology for assertion

see assert

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Time Traveler for assertion

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

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Last Updated

16 May 2022

Cite this Entry

“Assertion.” Dictionary, Merriam-Webster, Accessed 23 May. 2022.

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More Definitions for assertion


as·​ser·​tion | \ ə-ˈsər-shən How to pronounce assertion (audio) \

Kids Definition of assertion

1 : the act of stating clearly and strongly or making others aware the assertion of his innocence
2 : something stated as if certain made some wild assertions

More from Merriam-Webster on assertion

Nglish: Translation of assertion for Spanish Speakers

Britannica English: Translation of assertion for Arabic Speakers Encyclopedia article about assertion


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