noun (n)

• (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration(noun.process)

  source: wordnet30
• the spread of social institutions (and myths and skills) from one society to another(noun.event)

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

  Synonym:
  dissemination
  

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

  Example:
  The diffusion of knowledge.
  

  Synonym:
  dispersal, dispersion, dissemination
  

  source: wordnet30
• The act of diffusing, or the state of being diffused; a spreading; extension; dissemination; circulation; dispersion.(noun)

  source: webster1913