noun (n)

• a systematic interpretation or explanation (usually written) of a specific topic(noun.communication)

  Synonym:
  expounding
  

  source: wordnet30
• a collection of things (goods or works of art etc.) for public display(noun.group)

  Synonym:
  exhibition, expo
  

  source: wordnet30
• an account that sets forth the meaning or intent of a writing or discourse(noun.communication)

  Example:
  We would have understood the play better if there had been some initial exposition of the background.
  

  source: wordnet30
• (music) the section of a movement (especially in sonata form) where the major musical themes first occur(noun.communication)

  source: wordnet30
• The act of exposing or laying open; a setting out or displaying to public view.(noun)

  source: webster1913