Assertion
Assertion noun - A solemn and often public declaration of the truth or existence of something.
Usage example: the assertion that all men have certain unalienable rights is set forth in the Declaration of Independence
Claim is a synonym for assertion in statement topic. In some cases you can use "Claim" instead a noun "Assertion", when it comes to topics like demand, declaration, affirm. popular alternative
Claim
Claim noun - A solemn and often public declaration of the truth or existence of something.
Usage example: Galileo's claim that the moon has a very irregular surface and thus is not the perfect sphere that the ancients had imagined
Assertion is a synonym for claim in property topic. You can use "Assertion" instead a noun "Claim", if it concerns topics such as affirm, statement. popular alternative
Mutual synonyms
Related pairs
How words are described
Both words in one sentence
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Begging the Question: A logical fallacy where you claim to prove something simply by asserting that it's true (usually in slightly different wording; Circular Reasoning is similar, but with more than two steps intervening between the postulate and the assertion).
Source: Catch-22 Dilemma - Osborn laughs this claim off as ridiculous, but as soon as Rhodey leaves, he falls to his knees in anguish, indicating that Rhodey's assertion was 100 percent accurate.
Source: Cruel Mercy -
Inverted in The Long Earth, in which an AI manages to Logic Bomb the human international court system with an impossible-to-disprove assertion ... namely, its claim that it's actually human, being the reincarnation of a Tibetan who'd died at the same instant its processing system was activated.
Source: Logic Bomb
Cite this Source
Claim and Assertion. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/assertion/claim
Assertion & Claim. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/assertion/claim>.
Claim or Assertion. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/assertion/claim.
Google Ngram Viewer shows how "assertion" and "claim" have occurred on timeline