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English definition of “assert”

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assert

verb [T] uk   /əˈsɜːt/ us    /-ˈsɝːt/
assert yourself
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C2 to behave in a way that expresses your confidence, importance, or power and earns you respect from others: I really must assert myself more in meetings.
C1 formal to say that something is certainly true: [+ that] He asserts that she stole money from him.C2 to do something to show that you have power: Throughout the Cold War, the Allies asserted their right to move freely between the two Berlins. She very rarely asserts her authority over the children.
(Definition of assert from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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