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

An argument has been made that Kanye’s show doesn’t include any political messaging, coupled with Kraft’s assertion that Macklemore’s comment constitutes hate speech. — Shirley Halperin, Rolling Stone, 17 Sep. 2026

North Carolina’s violent-crime rate remains somewhat above the national average, but available federal data do not support Trump’s assertion that the state is among the most violent in the country. — Nora O'Neill, Charlotte Observer, 17 Sep. 2026

The department disputed the assertion that the detective declined the family’s pleas. — Connor Sheets, Los Angeles Times, 16 Sep. 2026

On September 16, a statement from Buckingham Palace (per People) refuted Spencer’s assertions. — Hannah Malach, InStyle, 16 Sep. 2026