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Definition of assertion noun from the Oxford Advanced Learner's Dictionary

assertion

noun
 
/əˈsɜːʃn/
 
/əˈsɜːrʃn/
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  1. [countable] a statement saying that you strongly believe something to be true synonym claim
    • He was correct in his assertion that the minister had been lying.
    • Do you have any evidence to support your assertions?
    Synonyms claimclaimallegation assertionThese are all words for a statement that something is true, although it has not been proved.claim a statement that something is true, although it has not been proved.allegation (rather formal) a public statement that is made without giving proof, accusing somebody of doing something that is wrong or illegal.assertion (rather formal) a statement of something that you strongly believe to be true, although it has not been proved. claim or assertion?When the point in doubt is a matter of opinion, not fact, use assertion: She made sweeping claims about the role of women in society. When you are talking about a matter of fact, you can use either word; an assertion may be slightly stronger than a claim and it is a more formal word.Patterns
    • a(n) claim/​allegation/​assertion that…
    • a(n) claim/​allegation/​assertion about/​of something
    • false/​unfounded/​conflicting claims/​allegations/​assertions
    • to make/​deny a(n) claim/​allegation/​assertion
    • to withdraw a(n) claim/​allegation
    Extra Examples
    • 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.
    Topics Opinion and argumentc1
    Oxford Collocations Dictionaryadjective
    • bold
    • confident
    • strong
    verb + assertion
    • make
    • justify
    • prove
    preposition
    • assertion about
    See full entry
  2. [uncountable, countable] the act of stating, using or claiming something strongly
    • the assertion of his authority
    • The demonstration was an assertion of the right to peaceful protest.
  3. Word Originlate Middle English: from Latin assertio(n-), from the verb asserere ‘claim, affirm’, from ad- ‘to’ + serere ‘to join’.
See assertion in the Oxford Advanced American DictionarySee assertion in the Oxford Learner's Dictionary of Academic English

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