Synonyms of assertion

assertion

noun

ə-ˈsər-shən 

1

as in declaration

a solemn and often public declaration of the truth or existence of something

the assertion that all men have certain unalienable rights is set forth in the Declaration of Independence

Synonyms & Similar Words

• declaration
• claim
• insistence
• allegation
• announcement
• affirmation
• proclamation
• argument
• avowal
• protestation
• profession
• asseveration
• pronouncement
• justification
• avouchment
• confirmation
• rationalization
• vindication
• reason
• reaffirmation
• reconfirmation

Antonyms & Near Antonyms

• question
• dispute
• disavowal
• disclaimer
• challenge
• refutation
• rebuttal
• denial
• contradiction
• negation
• disproof
• confutation

2

as in argument

an idea or opinion that is put forth in a discussion or debate

made the unlikely assertion that gravity affects light

Synonyms & Similar Words

• argument
• contention
• hypothesis
• thesis
• theory
• assumption
• guess
• hunch
• speculation
• proposition
• proposal
• conjecture
• explanation
• surmise
• rationale
• reason
• presupposition
• stand
• position
• supposition
• case

Example Sentences

Recent Examples of assertion

Reporting by Drilled and ProPublica did not contradict that assertion. — Katie Worth, ProPublica, 30 Oct. 2026

But records obtained through a public information request cast doubt on that assertion. — Mark Betancourt, NPR, 30 Oct. 2026

Federal prosecutors also have said voters won't be disenfranchised by delaying the tabulation of their ballots while their citizenship is checked — an assertion disputed by county election officials. — ABC News, 29 Oct. 2026

This idea, also fueled by the president’s unproven assertion that the 2020 election was stolen from him, has propelled numerous efforts to require proof of citizenship or identity at the polls or when registering to vote. — Sharon Bernstein, Sacbee.com, 26 Oct. 2026