assert in WordNet English dictionary

1. to declare or affirm solemnly and formally as true
   "Before God I swear I am innocent"
   affirm  verify  assert  avow  aver  swan  swear 
   
2. assert to be true
   "The letter asserts a free society"
   insist  assert 
   
3. state categorically
   assert  asseverate  maintain 
   
4. insist on having one's opinions and rights recognized
   "Women should assert themselves more!"
   assert  put forward