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

Whether the church’s assertions withstand analytic scrutiny is a different question. — Foreign Affairs, 10 Aug. 2026

Employees need to distinguish evidence from assertion, correlation from causation and plausible AI output from reliable information. — Bryan Robinson, Forbes.com, 10 Aug. 2026

So, how does the rest of the longevity world view their assertions? — Mark Ellwood, Robb Report, 9 Aug. 2026

The assertion that generally accepted AI safety practices don’t yet exist is inaccurate. — Chicago Tribune, 6 Aug. 2026