American English

Definition of assertion noun from the Oxford Advanced American Dictionary



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  1. 1[countable] a statement saying that you strongly believe something to be true synonym claim He was correct in his assertion that the senator had been lying. Do you have any evidence to support your assertions? Thesaurusclaimallegation assertionThese are all words for a statement that something is true, although it has not been proven.claim a statement that something is true, although it has not been provenallegation (somewhat formal) a public statement that has not been proven, that accuses someone of doing something that is wrong or illegalassertion (somewhat formal) a statement of something that you strongly believe to be true, although it has not been provenclaim 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
  2. 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.
See the Oxford Advanced Learner's Dictionary entry: assertion

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