Meaning of “assert” in the English Dictionary

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"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 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 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 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)