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English definition of “assertion”

assertion

noun [C + that]     /əˈsɜː.ʃən/ US  /-ˈsɝː-/
a statement that you strongly believe is true : I certainly don't agree with his assertion that men are better drivers than women.Assertions and asserting
(Definition of assertion noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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