aver 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. report or maintain
   "He alleged that he was the victim of a crime"; "He said it was too late to intervene in the war"; "The registrar says that I owe the school money"
   allege  aver  say