as ‧ ser ‧ tion /əˈsɜːʃ ə n $ -ɜːr-/ BrE AmE noun [countable]
something that you say or write that you strongly believe
assertion that
the assertion that house prices are falling
assertion of
her assertion of independence
assertion about
her assertions about the murder of her father
She makes very general assertions about marriage in the poem.
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THESAURUS
▪ claim a statement that something is true, even though it has not been proved:
It is difficult to believe some of the manufacturer's claims for its products.
▪ allegation a statement that someone has done something wrong or illegal, but that has not been proved:
He has strongly denied the allegations of sexual harassment.
▪ assertion formal something that you say or write that you strongly believe:
the assertion that house prices are falling
▪ contention formal a strong opinion that someone expresses:
Her main contention is that doctors should do more to encourage healthy eating.