inquiry in WordNet English dictionary

1. a systematic investigation of a matter of public interest
   inquiry  enquiry 
   
2. a search for knowledge
   "their pottery deserves more research than it has received"
   inquiry  enquiry  research 
   
3. an instance of questioning
   "there was a question about my training"; "we made inquiries of all those who were present"
   question  inquiry  enquiry  query  interrogation