noun (n)

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

  Synonym:
  airing, public exposure, spreading
  

  source: wordnet30
• the property of being diffused or dispersed(noun.attribute)

  Synonym:
  diffusion
  

  source: wordnet30
• the act of dispersing or diffusing something(noun.act)

  Synonym:
  diffusion, dispersal, dispersion
  

  source: wordnet30
• The act of disseminating, or the state of being disseminated; diffusion for propagation and permanence; a scattering or spreading abroad, as of ideas, beliefs, etc.(noun)

  source: webster1913