noun (n)

• breaking up and scattering by dispersion(noun.event)

  Example:
  The dissipation of the mist.
  

  source: wordnet30
• dissolute indulgence in sensual pleasure(noun.act)

  Synonym:
  dissolution, licentiousness, looseness, profligacy
  

  source: wordnet30
• useless or profitless activity; using or expending or consuming thoughtlessly or carelessly(noun.act)

  Example:
  Mindless dissipation of natural resources.
  

  Synonym:
  waste, wastefulness
  

  source: wordnet30
• The act of dissipating or dispersing; a state of dispersion or separation; dispersion; waste.(noun)

  source: webster1913