noun (n)

• an instance of questioning(noun.communication)

  Synonym:
  inquiry, interrogation, query, question
  Antonym:
  answer
  

  source: wordnet30
• a search for knowledge(noun.cognition)

  Synonym:
  inquiry, research
  

  source: wordnet30
• a systematic investigation of a matter of public interest(noun.act)

  Synonym:
  inquiry
  

  source: wordnet30
• See Inquiry.(noun)

  source: webster1913