assert Meaning in Cambridge American English Dictionary
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Meaning of "assert" - American English Dictionary

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assertverb [T]

 us   /əˈsɜrt/
to state an opinion or claim a right forcefully: [+ that clause] The companies have asserted that everything they did was appropriate. To assert is also to behave in a way that shows power, authority, or control: Several members of Congress called upon the president to assert leadership. If you assert yourself, you act forcefully in a way that expresses your confidence: You have to learn to speak up and assert yourself at meetings, or you’ll never get anywhere.
assertion
noun [C]  us   /əˈsɜr·ʃən/
Critics say the company forces workers to drive recklessly, an assertion the company denies.
(Definition of assert from the Cambridge Academic Content Dictionary © Cambridge University Press)
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