noun (n)

• process or result of distributing or extending over a wide expanse of space(noun.event)

  Synonym:
  spread
  

  source: wordnet30
• the opening of a subject to widespread discussion and debate(noun.communication)

  Synonym:
  airing, dissemination, public exposure
  

  source: wordnet30
• act of extending over a wider scope or expanse of space or time(noun.act)

  source: wordnet30