noun (n)

• the social process in which population and industry moves from urban centers to outlying districts(noun.process)

  Synonym:
  decentalisation
  

  source: wordnet30
• the spread of power away from the center to local branches or governments(noun.act)

  Synonym:
  decentralisation
  Antonym:
  centralisation, centralization
  

  source: wordnet30
• The action of decentralizing, or the state of being decentralized.(noun)

  source: webster1913