assert Meaning in the Cambridge English Dictionary
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Meaning of “assert” in the English Dictionary

"assert" in British English

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assertverb [T]

uk   /əˈsɜːt/  us   /-ˈsɝːt/
assert yourself
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C2 to ​behave in a way that ​expressesyourconfidence, ​importance, or ​power and ​earns you ​respect from ​others: I really must assert myself more in ​meetings.
C1 formal to say that something is ​certainlytrue: [+ that] He asserts that she ​stolemoney from him.C2 to do something to show that you have ​power: Throughout the Cold War, the Allies asserted ​their right to ​movefreely between the two Berlins. She very ​rarely asserts her authority over the ​children.
(Definition of assert from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"assert" in American English

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assertverb [T]

 us   /əˈsɜrt/
to ​state an ​opinion or ​claim a ​rightforcefully: [+ that clause] The ​companies have asserted that everything they did was ​appropriate. To assert is also to ​behave in a way that ​showspower, ​authority, or ​control: Several ​members of ​Congress called upon the ​president to assert ​leadership. If you assert yourself, you ​actforcefully in a way that ​expressesyourconfidence: 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 ​companyforcesworkers to ​driverecklessly, an assertion the ​companydenies.
(Definition of assert from the Cambridge Academic Content Dictionary © Cambridge University Press)
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