noun (n)

• an act of explaining that serves to clear up and cast light on(noun.communication)

  source: wordnet30
• an interpretation that removes obstacles to understanding(noun.communication)

  Synonym:
  clarification, illumination
  

  source: wordnet30
• A making clear; the act of elucidating or that which elucidates, as an explanation, an exposition, an illustration; as, one example may serve for further elucidation of the subject.(noun)

  source: webster1913