assert meaning, assert definition | English Cobuild dictionary

Collins

assert  

  ( asserts    3rd person present)   ( asserting    present participle)   ( asserted    past tense & past participle  )
1       verb   If someone asserts a fact or belief, they state it firmly.  
FORMAL  
(=declare)  

Mr. Helm plans to assert that the bill violates the First Amendment...      V that  
The defendants, who continue to assert their innocence, are expected to appeal...      V n  
Altman asserted, `We were making a political statement about western civilisation and greed.'      V with quote  
  assertion     ( assertions    plural)    n-var  
There is no concrete evidence to support assertions that the recession is truly over.     
2       verb   If you assert your authority, you make it clear by your behaviour that you have authority.   (=establish)  
After the war, the army made an attempt to assert its authority in the south of the country...      V n  
  assertion      n-uncount   usu N of n  
The decision is seen as an assertion of his authority within the company.     
3       verb   If you assert your right or claim to something, you insist that you have the right to it.  
The republics began asserting their right to govern themselves.      V n  
  assertion      n-uncount   usu N of n  
These institutions have made the assertion of ethnic identity possible.     
4       verb   If you assertyourself, you speak and act in a forceful way, so that people take notice of you.  
He's speaking up and asserting himself confidently.      V pron-refl  
Translation English - Cobuild Collins Dictionary  
Collins

assert  

1    affirm, allege, asseverate, attest, aver, avouch     (archaic)   avow, contend, declare, maintain, predicate, profess, pronounce, state, swear  
2    claim, defend, insist upon, press, put forward, stand up for, stress, uphold, vindicate  
3    assert oneself      exert one's influence, make one's presence felt, put oneself forward, put one's foot down     (informal)  
  
Antonyms     
  
1 & 2    deny, disavow, disclaim, rebut, refute, retract  

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"