C1noun3K

Assertion

UK /["/əˈsɜːʃn/"]/US /["/əˈsɜːrʃn/"]/

Definition

a statement saying that you strongly believe something to be true

In simple words: A statement that someone believes is true.

Examples

  • He was correct in his assertion that the minister had been lying.
  • Do you have any evidence to support your assertions?
  • Your assertion is not supported by the facts.
  • Researchers have recently challenged these assertions.
  • The argument needs to progress beyond the simple assertion that criminals are made not born.
  • They made sweeping assertions about the role of women in society.
  • the assertion of his authority
  • The demonstration was an assertion of the right to peaceful protest.

Usage notes

Use 'assertion' in formal contexts such as academic writing or debates. It is less common in everyday conversation. Avoid using it when speaking informally.

Grammar pattern

assertion + (that) clause

Memory hint

Think of 'assert' as being 'sure' — you assert something when you are sure it's true.

Collocations

  • bold
  • confident
  • strong
  • make
  • justify
  • prove
  • assertion about

Synonyms

  • statement
  • claim
  • declaration
  • allegation
  • affirmation

Antonyms

  • denial
  • rejection

Common mistakes

  • Confusing 'assertion' with 'assumption', which means a belief without proof.
  • Using 'assert' without a clear object; it should be 'he made an assertion'.