assert

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Concise Oxford English Dictionary © 2008 Oxford University Press:
assert/əˈsɜːt/
verb
  • 1 state a fact or belief confidently and forcefully.
  • 2 cause others to recognize (one's authority or a right) by confident and forceful behaviour.

    ■ (assert oneself) behave or speak confidently and forcefully.

– derivatives
asserter (also assertor) noun.
– origin C17 (earlier (ME) as assertion): from L. asserere ‘claim, affirm’, from ad- ‘to’ + serere ‘to join’.
'assert' also found in these Oxford entries:

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