Longman Dictionary of Contemporary English homepage

assertion

 noun
     
as‧ser‧tion [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.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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