verify 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. check or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard
   "Are you controlling for the temperature?"
   control  verify 
   
3. confirm the truth of
   "Please verify that the doors are closed"; "verify a claim"
   verify 
   
4. attach or append a legal verification to (a pleading or petition)
   verify