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.

Synonyms

• declaration
• claim
• insistence
• allegation

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

In that sense, the order of mandating English serves as a political marker—an assertion of identity in an era of demographic transformation. —Doug Melville, Forbes.com, 15 Sep. 2025

Things that may shimmy and shake, but things nonetheless, not ideological assertions. —Adam Gopnik, New Yorker, 15 Sep. 2025

No brusque acceleration but assertions of near-zero inflation clearly ring false. —Edward Lotterman, Twin Cities, 14 Sep. 2025

The main one is the assertion of judicial power by the Federal Supreme Court and the Superior Electoral Court (TSE). —Omar G. Encarnación, Time, 12 Sep. 2025

Word History

Etymology

see assert

First Known Use

15th century, in the meaning defined above

Phrases Containing assertion

• self-assertion

Rhymes for assertion

• cistercian
• coercion
• desertion
• exertion
• insertion
• mercian
• overexertion
• reassertion

Kids Definition

assertion

noun

as·​ser·​tion ə-ˈsər-shən 

a-

: the act of asserting

also : something asserted : declaration